diff --git a/pkg/common/storage/database/mgo/msg.go b/pkg/common/storage/database/mgo/msg.go
index 9e220072e..83fefbfe6 100644
--- a/pkg/common/storage/database/mgo/msg.go
+++ b/pkg/common/storage/database/mgo/msg.go
@@ -1125,8 +1125,6 @@ func (m *MsgMgo) findBeforeDocSendTime(ctx context.Context, docID string, limit
 			"$project": bson.M{
 				"_id":    0,
 				"doc_id": 0,
-				//"msgs.msg.send_time": 1,
-				//"msgs.msg.seq":       1,
 			},
 		},
 		{