diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
index 9f358df1122c..6b1a78bc2a1a 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
@@ -7907,6 +7907,10 @@
           "description": "WebHook activity properties.",
           "x-ms-client-flatten": true,
           "$ref": "#/definitions/WebHookActivityTypeProperties"
+        },
+        "policy": {
+          "$ref": "#/definitions/SecureInputOutputPolicy",
+          "description": "Activity policy."
         }
       },
       "required": [