diff --git a/internal/querynode/index_loader.go b/internal/querynode/index_loader.go
index f9e36af41e..6f2ba4391e 100644
--- a/internal/querynode/index_loader.go
+++ b/internal/querynode/index_loader.go
@@ -53,6 +53,7 @@ type indexLoader struct {
 	kv kv.DataKV // minio kv
 }
 
+// loadIndex would load index to segment
 func (loader *indexLoader) loadIndex(segment *Segment, fieldID FieldID) error {
 	// 1. use msg's index paths to get index bytes
 	var err error