diff --git a/registry/storage/blobserver.go b/registry/storage/blobserver.go
index 6beef7e3ea9..e61e4424b45 100644
--- a/registry/storage/blobserver.go
+++ b/registry/storage/blobserver.go
@@ -34,7 +34,7 @@ func (bs *blobServer) ServeBlob(ctx context.Context, w http.ResponseWriter, r *h
 		return err
 	}
 
-	if bs.redirect {
+	if bs.redirect { // redirect url
 		redirectURL, err := bs.driver.RedirectURL(r, path)
 		if err != nil {
 			return err
diff --git a/registry/storage/registry.go b/registry/storage/registry.go
index ecf483bf9c2..08a8d3d70f7 100644
--- a/registry/storage/registry.go
+++ b/registry/storage/registry.go
@@ -35,7 +35,7 @@ type RegistryOption func(*registry) error
 
 // EnableRedirect is a functional option for NewRegistry. It causes the backend
 // blob server to attempt using (StorageDriver).RedirectURL to serve all blobs.
-func EnableRedirect(registry *registry) error {
+func EnableRedirect(registry *registry) error { // 是否 enable redirect
 	registry.blobServer.redirect = true
 	return nil
 }