diff --git a/internal/querynode/index_info.go b/internal/querynode/index_info.go
index 7ebcd98d6b..572eac38d8 100644
--- a/internal/querynode/index_info.go
+++ b/internal/querynode/index_info.go
@@ -43,6 +43,7 @@ func (info *indexInfo) setIndexID(id UniqueID) {
 	info.indexID = id
 }
 
+// setBuildID sets the build id of index
 func (info *indexInfo) setBuildID(id UniqueID) {
 	info.buildID = id
 }