diff --git a/internal/querynode/load_index_info.go b/internal/querynode/load_index_info.go
index b326fd81c24a248c781c72c00716c5f1946a2005..7678a5978b2b93366a18c9ebf85cb83552440c59 100644
--- a/internal/querynode/load_index_info.go
+++ b/internal/querynode/load_index_info.go
@@ -70,6 +70,7 @@ func (li *LoadIndexInfo) appendFieldInfo(fieldID FieldID) error {
 	return HandleCStatus(&status, "AppendFieldInfo failed")
 }
 
+// appendIndex appends binarySet index to cLoadIndexInfo
 func (li *LoadIndexInfo) appendIndex(bytesIndex [][]byte, indexKeys []string) error {
 	var cBinarySet C.CBinarySet
 	status := C.NewBinarySet(&cBinarySet)