diff --git a/internal/querycoord/meta.go b/internal/querycoord/meta.go
index 10e2ee7d36..85d39047a6 100644
--- a/internal/querycoord/meta.go
+++ b/internal/querycoord/meta.go
@@ -71,6 +71,7 @@ type Meta interface {
 	//printMeta()
 }
 
+// MetaReplica records the current load information on all querynodes
 type MetaReplica struct {
 	client kv.MetaKv // client of a reliable kv service, i.e. etcd client