diff --git a/specification/common-types/resource-management/v2/types.json b/specification/common-types/resource-management/v2/types.json
index ee85b006830f..17ac4bfe6cf7 100644
--- a/specification/common-types/resource-management/v2/types.json
+++ b/specification/common-types/resource-management/v2/types.json
@@ -496,7 +496,7 @@
         "lastModifiedAt": {
           "type": "string",
           "format": "date-time",
-          "description": "The type of identity that last modified the resource."
+          "description": "The timestamp when the resource was last modified (UTC)."
         }
       }
     },