diff --git a/specification/appconfiguration/resource-manager/Microsoft.AppConfiguration/preview/2021-03-01-preview/appconfiguration.json b/specification/appconfiguration/resource-manager/Microsoft.AppConfiguration/preview/2021-03-01-preview/appconfiguration.json
index 0607f2b84c9f..187d6c17f486 100644
--- a/specification/appconfiguration/resource-manager/Microsoft.AppConfiguration/preview/2021-03-01-preview/appconfiguration.json
+++ b/specification/appconfiguration/resource-manager/Microsoft.AppConfiguration/preview/2021-03-01-preview/appconfiguration.json
@@ -1220,6 +1220,18 @@
         "disableLocalAuth": {
           "type": "boolean",
           "description": "Disables all authentication methods other than AAD authentication."
+        },
+        "publicNetworkAccess": {
+          "description": "Control permission for data plane traffic coming from public networks while private endpoint is enabled.",
+          "enum": [
+            "Enabled",
+            "Disabled"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "PublicNetworkAccess",
+            "modelAsString": true
+          }
         }
       }
     },