diff --git a/internal/indexcoord/meta_table.go b/internal/indexcoord/meta_table.go
index 9bbba4c2fbd0dbca830cd314b9c3bfcda5879bd5..968bf238e61906c8c8348bdae1adc072e55c5b7e 100644
--- a/internal/indexcoord/meta_table.go
+++ b/internal/indexcoord/meta_table.go
@@ -111,6 +111,7 @@ func (mt *metaTable) saveIndexMeta(meta *Meta) error {
 	return nil
 }
 
+// reloadMeta reloads the index meta corresponding indexBuildID from ETCD.
 func (mt *metaTable) reloadMeta(indexBuildID UniqueID) (*Meta, error) {
 	key := "indexes/" + strconv.FormatInt(indexBuildID, 10)