diff --git a/internal/querynode/index_info.go b/internal/querynode/index_info.go
index d8a8e59e7d..1b94866d3f 100644
--- a/internal/querynode/index_info.go
+++ b/internal/querynode/index_info.go
@@ -80,6 +80,7 @@ func (info *indexInfo) getIndexID() UniqueID {
 	return info.indexID
 }
 
+// getBuildID returns the build id of index
 func (info *indexInfo) getBuildID() UniqueID {
 	return info.buildID
 }