diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/NetworkSecurityGroupCreate.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/NetworkSecurityGroupCreate.json
index cfae98f8933a..e554351db3e2 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/NetworkSecurityGroupCreate.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/NetworkSecurityGroupCreate.json
@@ -17,6 +17,7 @@
         "location": "eastus",
         "properties": {
           "provisioningState": "Succeeded",
+          "flushConnection": false,
           "securityRules": [],
           "defaultSecurityRules": [
             {
@@ -127,6 +128,7 @@
         "location": "eastus",
         "properties": {
           "provisioningState": "Succeeded",
+          "flushConnection": false,
           "securityRules": [],
           "defaultSecurityRules": [
             {
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/networkSecurityGroup.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/networkSecurityGroup.json
index 10909e8cb774..7f2b525a6edd 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/networkSecurityGroup.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/networkSecurityGroup.json
@@ -870,6 +870,10 @@
     },
     "NetworkSecurityGroupPropertiesFormat": {
       "properties": {
+        "flushConnection": {
+          "type": "boolean",
+          "description": "When enabled, flows created from Network Security Group connections will be re-evaluated when rules are updates. Initial enablement will trigger re-evaluation."
+        },
         "securityRules": {
           "type": "array",
           "items": {