diff --git a/registry/directory/directory.go b/registry/directory/directory.go
index fe922cb98056bd79bc07cd6eb42375e8c07464af..fe77f3c6573e1b7d2a81cd6654504bae468dc26f 100644
--- a/registry/directory/directory.go
+++ b/registry/directory/directory.go
@@ -90,7 +90,7 @@ func (dir *RegistryDirectory) Notify(event *registry.ServiceEvent) {
 	go dir.update(event)
 }
 
-// update: subscribe service from registry, and update the cacheServices
+// update the cacheServices and subscribe service from registry
 func (dir *RegistryDirectory) update(res *registry.ServiceEvent) {
 	if res == nil {
 		return