diff --git a/models/schema/comment.js b/models/schema/comment.js
index 7ae51ff41..bdc5bb2f8 100644
--- a/models/schema/comment.js
+++ b/models/schema/comment.js
@@ -163,6 +163,12 @@ Comment.index({
   created_at: -1,
 });
 
+Comment.index({
+  asset_id: 1,
+  parent_id: 1,
+  created_at: 1,
+});
+
 Comment.index(
   {
     'action_counts.flag': 1,