diff --git a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json
index 82529f996adc..dc1b15ec78d2 100644
--- a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json
+++ b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/CommonDefinitions.json
@@ -612,6 +612,10 @@
           "description": "ARM resource ID of the source app. App resource ID is of the form \n/subscriptions/{subId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{siteName} for production slots and \n/subscriptions/{subId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{siteName}/slots/{slotName} for other slots.",
           "type": "string"
         },
+        "sourceWebAppLocation": {
+          "description": "Location of source app ex: West US or North Europe",
+          "type": "string"
+        },
         "hostingEnvironment": {
           "description": "App Service Environment.",
           "type": "string"