diff --git a/specification/eventgrid/data-plane/Microsoft.AppConfiguration/stable/2018-01-01/AppConfiguration.json b/specification/eventgrid/data-plane/Microsoft.AppConfiguration/stable/2018-01-01/AppConfiguration.json
index aed780d15360..d13e2d9eb9ae 100644
--- a/specification/eventgrid/data-plane/Microsoft.AppConfiguration/stable/2018-01-01/AppConfiguration.json
+++ b/specification/eventgrid/data-plane/Microsoft.AppConfiguration/stable/2018-01-01/AppConfiguration.json
@@ -22,6 +22,10 @@
         "etag": {
           "description": "The etag representing the new state of the key-value.",
           "type": "string"
+        },
+        "syncToken": {
+          "description": "The sync token representing the server state after the event.",
+          "type": "string"
         }
       }
     },
@@ -40,6 +44,10 @@
         "etag": {
           "description": "The etag representing the key-value that was deleted.",
           "type": "string"
+        },
+        "syncToken": {
+          "description": "The sync token representing the server state after the event.",
+          "type": "string"
         }
       }
     }