diff --git a/collection/opendb-news-favorite/collection.json b/collection/opendb-news-favorite/collection.json
index 264a303..fdc6a13 100644
--- a/collection/opendb-news-favorite/collection.json
+++ b/collection/opendb-news-favorite/collection.json
@@ -28,15 +28,19 @@
   },
   "index": [
       {
-      "IndexName": "article_id_",
+      "IndexName": "article_user_",
       "MgoKeySchema": {
         "MgoIndexKeys": [
           {
             "Name": "article_id",
             "Direction": "1"
+          },
+          {
+            "Name": "user_id",
+            "Direction": "1"
           }
         ],
-        "MgoIsUnique": false
+        "MgoIsUnique": true
       }
     }
   ]