diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2020-03-01/applicationGateway.json b/specification/network/resource-manager/Microsoft.Network/stable/2020-03-01/applicationGateway.json
index d41c790a15db..6c1aa3a2f805 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2020-03-01/applicationGateway.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2020-03-01/applicationGateway.json
@@ -2235,6 +2235,10 @@
             "$ref": "#/definitions/ApplicationGatewayCustomError"
           },
           "description": "Custom error configurations of the application gateway resource."
+        },
+        "forceFirewallPolicyAssociation": {
+          "type": "boolean",
+          "description": "If true, associates a firewall policy with an application gateway regardless whether the policy differs from the WAF Config."
         }
       },
       "description": "Properties of the application gateway."