diff --git a/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-07-01-preview/cosmos-db.json b/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-07-01-preview/cosmos-db.json
index 19cf8effecb2..8969b508d131 100644
--- a/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-07-01-preview/cosmos-db.json
+++ b/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-07-01-preview/cosmos-db.json
@@ -8598,7 +8598,8 @@
         }
       },
       "required": [
-        "id"
+        "id",
+        "viewDefinition"
       ]
     },
     "CreateUpdateOptions": {