diff --git a/internal/querynode/index_info.go b/internal/querynode/index_info.go
index 8bb8e3ec27..cae029ca72 100644
--- a/internal/querynode/index_info.go
+++ b/internal/querynode/index_info.go
@@ -73,6 +73,7 @@ func (info *indexInfo) getIndexName() string {
 	return info.indexName
 }
 
+// getIndexID returns the index id
 func (info *indexInfo) getIndexID() UniqueID {
 	return info.indexID
 }