diff --git a/internal/querycoord/query_coord.go b/internal/querycoord/query_coord.go
index 1f6a4a8dd078819a42bf3caab35e86e46fd00f36..5e8a0c8e8c2aee45a21a2ab82f41aa353d004577 100644
--- a/internal/querycoord/query_coord.go
+++ b/internal/querycoord/query_coord.go
@@ -45,6 +45,7 @@ type queryChannelInfo struct {
 	responseChannel string
 }
 
+// QueryCoord is the coordinator of queryNodes
 type QueryCoord struct {
 	loopCtx    context.Context
 	loopCancel context.CancelFunc