diff --git a/internal/querynode/index_info.go b/internal/querynode/index_info.go
index 1b94866d3f..6f4298da01 100644
--- a/internal/querynode/index_info.go
+++ b/internal/querynode/index_info.go
@@ -85,6 +85,7 @@ func (info *indexInfo) getBuildID() UniqueID {
 	return info.buildID
 }
 
+// getFieldID returns filed id of index
 func (info *indexInfo) getFieldID() UniqueID {
 	return info.fieldID
 }