diff --git a/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangeDetails.json b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangeDetails.json
new file mode 100644
index 000000000000..b7311949aeaa
--- /dev/null
+++ b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangeDetails.json
@@ -0,0 +1,119 @@
+{
+  "title": "Resource Change Details Query",
+  "description": "A resource change details query.",
+  "parameters": {
+    "api-version": "2020-09-01-preview",
+    "parameters": {
+      "resourceIds": [
+        "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount"
+      ],
+      "changeIds": [
+        "53dc0515-b86b-4bc2-979b-e4694ab4a556"
+      ]
+    }
+  },
+  "responses": {
+    "200": {
+      "body": [
+        {
+          "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+          "changeId": "53dc0515-b86b-4bc2-979b-e4694ab4a556",
+          "beforeSnapshot": {
+            "timestamp": "2018-10-31T01:32:05.993Z",
+            "content": {
+              "sku": {
+                "name": "Standard_LRS",
+                "tier": "Standard"
+              },
+              "kind": "Storage",
+              "id": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+              "name": "mystorageaccount",
+              "type": "Microsoft.Storage/storageAccounts",
+              "location": "westus",
+              "tags": {},
+              "properties": {
+                "networkAcls": {
+                  "bypass": "AzureServices",
+                  "virtualNetworkRules": [],
+                  "ipRules": [],
+                  "defaultAction": "Allow"
+                },
+                "supportsHttpsTrafficOnly": false,
+                "encryption": {
+                  "services": {
+                    "file": {
+                      "enabled": true,
+                      "lastEnabledTime": "2018-07-27T18:37:21.8333895Z"
+                    },
+                    "blob": {
+                      "enabled": true,
+                      "lastEnabledTime": "2018-07-27T18:37:21.8333895Z"
+                    }
+                  },
+                  "keySource": "Microsoft.Storage"
+                },
+                "provisioningState": "Succeeded",
+                "creationTime": "2018-07-27T18:37:21.7708872Z",
+                "primaryEndpoints": {
+                  "blob": "https://mystorageaccount.blob.core.windows.net/",
+                  "queue": "https://mystorageaccount.queue.core.windows.net/",
+                  "table": "https://mystorageaccount.table.core.windows.net/",
+                  "file": "https://mystorageaccount.file.core.windows.net/"
+                },
+                "primaryLocation": "westus",
+                "statusOfPrimary": "available"
+              }
+            }
+          },
+          "afterSnapshot": {
+            "timestamp": "2018-10-31T01:54:24.42Z",
+            "content": {
+              "sku": {
+                "name": "Standard_LRS",
+                "tier": "Standard"
+              },
+              "kind": "Storage",
+              "id": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+              "name": "mystorageaccount",
+              "type": "Microsoft.Storage/storageAccounts",
+              "location": "westus",
+              "tags": {},
+              "properties": {
+                "networkAcls": {
+                  "bypass": "AzureServices",
+                  "virtualNetworkRules": [],
+                  "ipRules": [],
+                  "defaultAction": "Allow"
+                },
+                "supportsHttpsTrafficOnly": true,
+                "encryption": {
+                  "services": {
+                    "file": {
+                      "enabled": true,
+                      "lastEnabledTime": "2018-07-27T18:37:21.8333895Z"
+                    },
+                    "blob": {
+                      "enabled": true,
+                      "lastEnabledTime": "2018-07-27T18:37:21.8333895Z"
+                    }
+                  },
+                  "keySource": "Microsoft.Storage"
+                },
+                "provisioningState": "Succeeded",
+                "creationTime": "2018-07-27T18:37:21.7708872Z",
+                "primaryEndpoints": {
+                  "blob": "https://mystorageaccount.blob.core.windows.net/",
+                  "queue": "https://mystorageaccount.queue.core.windows.net/",
+                  "table": "https://mystorageaccount.table.core.windows.net/",
+                  "file": "https://mystorageaccount.file.core.windows.net/"
+                },
+                "primaryLocation": "westus",
+                "statusOfPrimary": "available"
+              }
+            }
+          }
+        }
+      ]
+    }
+  }
+}
diff --git a/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChanges.json b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChanges.json
new file mode 100644
index 000000000000..382d95660259
--- /dev/null
+++ b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChanges.json
@@ -0,0 +1,46 @@
+{
+  "title": "Basic Resource Changes Query",
+  "description": "A simple resource changes query.",
+  "parameters": {
+    "api-version": "2020-09-01-preview",
+    "parameters": {
+      "resourceIds": [
+        "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount"
+      ],
+      "interval": {
+        "start": "2018-10-30T12:09:03.141Z",
+        "end": "2018-10-31T12:09:03.141Z"
+      }
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "changes": [
+          {
+            "changeId": "2db0ad2d-f6f0-4f46-b529-5c4e8c494648",
+            "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+            "changeType": "Update",
+            "beforeSnapshot": {
+              "timestamp": "2018-10-31T01:32:05.993Z"
+            },
+            "afterSnapshot": {
+              "timestamp": "2018-10-31T01:54:24.42Z"
+            }
+          },
+          {
+            "changeId": "9dc352cb-b7c1-4198-9eda-e5e3ed66aec8",
+            "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+            "changeType": "Create",
+            "beforeSnapshot": {
+              "timestamp": "2018-10-30T10:30:19.68Z"
+            },
+            "afterSnapshot": {
+              "timestamp": "2018-10-30T21:12:31.337Z"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
diff --git a/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangesFirstPage.json b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangesFirstPage.json
new file mode 100644
index 000000000000..5df86f7bdb82
--- /dev/null
+++ b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangesFirstPage.json
@@ -0,0 +1,48 @@
+{
+  "title": "Resource Changes Query: First Page",
+  "description": "A resource changes query requesting the first page.",
+  "parameters": {
+    "api-version": "2020-09-01-preview",
+    "parameters": {
+      "resourceIds": [
+        "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount"
+      ],
+      "interval": {
+        "start": "2018-10-30T12:09:03.141Z",
+        "end": "2018-10-31T12:09:03.141Z"
+      },
+      "$top": 2
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "changes": [
+          {
+            "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+            "changeId": "2db0ad2d-f6f0-4f46-b529-5c4e8c494648",
+            "changeType": "Update",
+            "beforeSnapshot": {
+              "timestamp": "2018-10-31T01:32:05.993Z"
+            },
+            "afterSnapshot": {
+              "timestamp": "2018-10-31T01:54:24.42Z"
+            }
+          },
+          {
+            "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+            "changeId": "9dc352cb-b7c1-4198-9eda-e5e3ed66aec8",
+            "changeType": "Create",
+            "beforeSnapshot": {
+              "timestamp": "2018-10-30T10:30:19.68Z"
+            },
+            "afterSnapshot": {
+              "timestamp": "2018-10-30T21:12:31.337Z"
+            }
+          }
+        ],
+        "$skipToken": "ew0KICAiJGlkIjogIjEiLA0KICAiRW5kVGltZSI6ICJcL0RhdGUoMTU1MDc0NT"
+      }
+    }
+  }
+}
diff --git a/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangesNextPage.json b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangesNextPage.json
new file mode 100644
index 000000000000..51876247fb10
--- /dev/null
+++ b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/examples/ResourceChangesNextPage.json
@@ -0,0 +1,49 @@
+{
+  "title": "Resource Changes Query: Next Page",
+  "description": "A resource changes query requesting the next page using a skip token.",
+  "parameters": {
+    "api-version": "2020-04-01-preview",
+    "parameters": {
+      "resourceIds": [
+        "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount"
+      ],
+      "interval": {
+        "start": "2018-10-30T12:09:03.141Z",
+        "end": "2018-10-31T12:09:03.141Z"
+      },
+      "$top": 2,
+      "$skipToken": "ew0KICAiJGlkIjogIjEiLA0KICAiRW5kVGltZSI6ICJcL0RhdGUoMTU1MDc0NT"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "changes": [
+          {
+            "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+            "changeId": "55f458c4-f1c0-4963-bc6c-af275cd47702",
+            "changeType": "Update",
+            "beforeSnapshot": {
+              "timestamp": "2018-10-31T03:43:08.629Z"
+            },
+            "afterSnapshot": {
+              "timestamp": "2018-10-31T05:12:32.087Z"
+            }
+          },
+          {
+            "resourceId": "/subscriptions/4d962866-1e3f-47f2-bd18-450c08f914c1/resourceGroups/MyResourceGroup/providers/Microsoft.Storage/storageAccounts/mystorageaccount",
+            "changeId": "0495b929-b86d-46cc-a972-939145feed90",
+            "changeType": "Create",
+            "beforeSnapshot": {
+              "timestamp": "2018-10-31T01:54:24.42Z"
+            },
+            "afterSnapshot": {
+              "timestamp": "2018-10-31T02:01:02.163Z"
+            }
+          }
+        ],
+        "$skipToken": "kVGltZSI6ICJcL0RhdGUoMTU1MDc0NTew0KICAiJGlkIjogIjEiLA0KICAiRW5"
+      }
+    }
+  }
+}
diff --git a/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/resourcechanges.json b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/resourcechanges.json
new file mode 100644
index 000000000000..94eae9e88197
--- /dev/null
+++ b/specification/resourcegraph/resource-manager/Microsoft.ResourceGraph/preview/2020-09-01-preview/resourcechanges.json
@@ -0,0 +1,447 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "Azure Resource Graph",
+    "description": "Azure Resource Graph API Reference",
+    "version": "2020-09-01-preview"
+  },
+  "host": "management.azure.com",
+  "schemes": [
+    "https"
+  ],
+  "consumes": [
+    "application/json"
+  ],
+  "produces": [
+    "application/json"
+  ],
+  "security": [
+    {
+      "azure_auth": [
+        "user_impersonation"
+      ]
+    }
+  ],
+  "securityDefinitions": {
+    "azure_auth": {
+      "type": "oauth2",
+      "authorizationUrl": "https://login.microsoftonline.com/common/oauth2/authorize",
+      "flow": "implicit",
+      "description": "Azure Active Directory OAuth2 Flow",
+      "scopes": {
+        "user_impersonation": "impersonate your user account"
+      }
+    }
+  },
+  "paths": {
+    "/providers/Microsoft.ResourceGraph/resourceChanges": {
+      "post": {
+        "description": "List changes to a resource for a given time interval.",
+        "operationId": "ResourceChanges",
+        "tags": [
+          "Changes"
+        ],
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "name": "parameters",
+            "description": "the parameters for this request for changes.",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/ResourceChangesRequestParameters"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A list of changes associated with a resource over a specific time interval.",
+            "schema": {
+              "$ref": "#/definitions/ResourceChangeList"
+            }
+          },
+          "default": {
+            "description": "A response indicating an error.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "Basic query": {
+            "$ref": "./examples/ResourceChanges.json"
+          },
+          "First page query": {
+            "$ref": "./examples/ResourceChangesFirstPage.json"
+          },
+          "Next page query": {
+            "$ref": "./examples/ResourceChangesNextPage.json"
+          }
+        }
+      }
+    },
+    "/providers/Microsoft.ResourceGraph/resourceChangeDetails": {
+      "post": {
+        "description": "Get resource change details.",
+        "operationId": "ResourceChangeDetails",
+        "tags": [
+          "Changes"
+        ],
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "name": "parameters",
+            "description": "The parameters for this request for resource change details.",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/ResourceChangeDetailsRequestParameters"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Resource change details.",
+            "schema": {
+              "$ref": "#/definitions/ResourceChangeDataList"
+            }
+          },
+          "default": {
+            "description": "A response indicating an error.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "Basic query": {
+            "$ref": "./examples/ResourceChangeDetails.json"
+          }
+        }
+      }
+    }
+  },
+  "definitions": {
+    "ResourceChangesRequestParameters": {
+      "description": "The parameters for a specific changes request.",
+      "type": "object",
+      "properties": {
+        "resourceIds": {
+          "description": "Specifies the list of resources for a changes request.",
+          "type": "array",
+          "items": {
+            "type": "string",
+            "description": "Specifies the resource for a changes request."
+          }
+        },
+        "subscriptionId": {
+          "description": "The subscription id of resources to query the changes from. ",
+          "type": "string"
+        },
+        "interval": {
+          "description": "Specifies the date and time interval for a changes request.",
+          "type": "object",
+          "allOf": [
+            {
+              "$ref": "#/definitions/DateTimeInterval"
+            }
+          ]
+        },
+        "$skipToken": {
+          "description": "Acts as the continuation token for paged responses.",
+          "type": "string"
+        },
+        "$top": {
+          "description": "The maximum number of changes the client can accept in a paged response.",
+          "type": "integer",
+          "format": "int32",
+          "minimum": 1,
+          "maximum": 1000
+        },
+        "table": {
+          "description": "The table name to query resources from.",
+          "type": "string"
+        },
+        "fetchPropertyChanges": {
+          "description": "The flag if set to true will fetch property changes",
+          "type": "boolean"
+        },
+        "fetchSnapshots": {
+          "description": "The flag if set to true will fetch change snapshots",
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "interval"
+      ]
+    },
+    "ResourceChangeList": {
+      "description": "A list of changes associated with a resource over a specific time interval.",
+      "type": "object",
+      "properties": {
+        "changes": {
+          "description": "The pageable value returned by the operation, i.e. a list of changes to the resource.\n\n- The list is ordered from the most recent changes to the least recent changes.\n- This list will be empty if there were no changes during the requested interval.\n- The `Before` snapshot timestamp value of the oldest change can be outside of the specified time interval.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/ResourceChangeData"
+          }
+        },
+        "$skipToken": {
+          "description": "Skip token that encodes the skip information while executing the current request"
+        }
+      }
+    },
+    "ResourceChangeDataList": {
+      "description": "A list of change details associated with a resource over a specific time interval.",
+      "type": "array",
+      "items": {
+        "$ref": "#/definitions/ResourceChangeData"
+      }
+    },
+    "ResourceChangeData": {
+      "description": "Data on a specific change, represented by a pair of before and after resource snapshots.",
+      "type": "object",
+      "properties": {
+        "resourceId": {
+          "description": "The resource for a change.",
+          "type": "string"
+        },
+        "changeId": {
+          "description": "The change ID. Valid and unique within the specified resource only.",
+          "type": "string"
+        },
+        "beforeSnapshot": {
+          "description": "The snapshot before the change.",
+          "allOf": [
+            {
+              "$ref": "#/definitions/ResourceSnapshotData"
+            }
+          ]
+        },
+        "afterSnapshot": {
+          "description": "The snapshot after the change.",
+          "allOf": [
+            {
+              "$ref": "#/definitions/ResourceSnapshotData"
+            }
+          ]
+        },
+        "changeType": {
+          "description": "The change type for snapshot. PropertyChanges will be provided in case of Update change type",
+          "type": "string",
+          "enum": [
+            "Create",
+            "Update",
+            "Delete"
+          ],
+          "x-ms-enum": {
+            "name": "ChangeType",
+            "modelAsString": false
+          }
+        },
+        "propertyChanges": {
+          "description": "An array of resource property change",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/ResourcePropertyChange"
+          }
+        }
+      },
+      "required": [
+        "changeId",
+        "beforeSnapshot",
+        "afterSnapshot"
+      ]
+    },
+    "ResourcePropertyChange": {
+      "description": "The resource property change",
+      "type": "object",
+      "properties": {
+        "propertyName": {
+          "description": "The property name",
+          "type": "string"
+        },
+        "beforeValue": {
+          "description": "The property value in before snapshot",
+          "type": "string"
+        },
+        "afterValue": {
+          "description": "The property value in after snapshot",
+          "type": "string"
+        },
+        "changeCategory": {
+          "description": "The change category.",
+          "type": "string",
+          "enum": [
+            "User",
+            "System"
+          ],
+          "x-ms-enum": {
+            "name": "ChangeCategory",
+            "modelAsString": false
+          }
+        },
+        "propertyChangeType": {
+          "description": "The property change Type",
+          "type": "string",
+          "enum": [
+            "Insert",
+            "Update",
+            "Remove"
+          ],
+          "x-ms-enum": {
+            "name": "PropertyChangeType",
+            "modelAsString": false
+          }
+        }
+      },
+      "required": [
+        "propertyName",
+        "changeCategory",
+        "propertyChangeType"
+      ]
+    },
+    "ResourceSnapshotData": {
+      "description": "Data on a specific resource snapshot.",
+      "type": "object",
+      "properties": {
+        "snapshotId": {
+          "description": "The ID of the snapshot.",
+          "type": "string"
+        },
+        "timestamp": {
+          "description": "The time when the snapshot was created.\nThe snapshot timestamp provides an approximation as to when a modification to a resource was detected.  There can be a difference between the actual modification time and the detection time.  This is due to differences in how operations that modify a resource are processed, versus how operation that record resource snapshots are processed.",
+          "type": "string",
+          "format": "date-time"
+        },
+        "content": {
+          "description": "The resource snapshot content (in resourceChangeDetails response only).",
+          "type": "object"
+        }
+      },
+      "required": [
+        "timestamp"
+      ]
+    },
+    "ResourceChangeDetailsRequestParameters": {
+      "description": "The parameters for a specific change details request.",
+      "type": "object",
+      "properties": {
+        "resourceIds": {
+          "description": "Specifies the list of resources for a change details request.",
+          "type": "array",
+          "items": {
+            "type": "string",
+            "description": "Specifies the resource for a change details request."
+          }
+        },
+        "changeIds": {
+          "description": "Specifies the list of change IDs for a change details request.",
+          "type": "array",
+          "items": {
+            "type": "string",
+            "description": "Specifies the change ID."
+          }
+        }
+      },
+      "required": [
+        "resourceIds",
+        "changeIds"
+      ]
+    },
+    "DateTimeInterval": {
+      "description": "An interval in time specifying the date and time for the inclusive start and exclusive end, i.e. `[start, end)`.",
+      "type": "object",
+      "properties": {
+        "start": {
+          "description": "A datetime indicating the inclusive/closed start of the time interval, i.e. `[`**`start`**`, end)`. Specifying a `start` that occurs chronologically after `end` will result in an error.",
+          "type": "string",
+          "format": "date-time"
+        },
+        "end": {
+          "description": "A datetime indicating the exclusive/open end of the time interval, i.e. `[start, `**`end`**`)`. Specifying an `end` that occurs chronologically before `start` will result in an error.",
+          "type": "string",
+          "format": "date-time"
+        }
+      },
+      "required": [
+        "start",
+        "end"
+      ]
+    },
+    "ErrorResponse": {
+      "title": "Error response.",
+      "type": "object",
+      "description": "An error response from the API.",
+      "properties": {
+        "error": {
+          "$ref": "#/definitions/Error",
+          "description": "Error information."
+        }
+      },
+      "required": [
+        "error"
+      ]
+    },
+    "Error": {
+      "title": "Error info.",
+      "type": "object",
+      "description": "Error details.",
+      "properties": {
+        "code": {
+          "type": "string",
+          "description": "Error code identifying the specific error."
+        },
+        "message": {
+          "type": "string",
+          "description": "A human readable error message."
+        },
+        "details": {
+          "type": "array",
+          "description": "Error details",
+          "items": {
+            "$ref": "#/definitions/ErrorDetails"
+          }
+        }
+      },
+      "required": [
+        "code",
+        "message"
+      ]
+    },
+    "ErrorDetails": {
+      "title": "Error details.",
+      "type": "object",
+      "properties": {
+        "code": {
+          "type": "string",
+          "description": "Error code identifying the specific error."
+        },
+        "message": {
+          "type": "string",
+          "description": "A human readable error message."
+        }
+      },
+      "additionalProperties": {
+        "type": "object"
+      },
+      "required": [
+        "code",
+        "message"
+      ]
+    }
+  },
+  "parameters": {
+    "ApiVersionParameter": {
+      "name": "api-version",
+      "in": "query",
+      "required": true,
+      "type": "string",
+      "description": "Api Version."
+    }
+  }
+}
diff --git a/specification/resourcegraph/resource-manager/readme.md b/specification/resourcegraph/resource-manager/readme.md
index c016a7489782..367f03d2fa09 100644
--- a/specification/resourcegraph/resource-manager/readme.md
+++ b/specification/resourcegraph/resource-manager/readme.md
@@ -27,7 +27,7 @@ These are the global settings for the ResourceGraph API.
 ``` yaml
 title: ResourceGraphClient
 openapi-type: arm
-tag: package-preview-2020-04
+tag: package-preview-2020-09
 ```
 
 ### Validations
@@ -40,6 +40,16 @@ semantic-validator: true
 model-validator: true
 message-format: json
 ```
+### Tag: package-preview-2020-09
+
+These settings apply only when `--tag=package-preview-2020-09` is specified on the command line.
+
+``` yaml $(tag) == 'package-preview-2020-09'
+input-file:
+  - Microsoft.ResourceGraph/preview/2020-09-01-preview/resourcechanges.json
+  - Microsoft.ResourceGraph/preview/2020-04-01-preview/resourcegraph.json
+  - Microsoft.ResourceGraph/preview/2020-04-01-preview/resourceshistory.json
+```
 
 ### Tag: package-preview-2020-04