diff --git a/src/Attributes/Response.php b/src/Attributes/Response.php
index 1d5135333..719aacc4b 100644
--- a/src/Attributes/Response.php
+++ b/src/Attributes/Response.php
@@ -23,6 +23,7 @@ public function __construct(
         ?array $attachables = null
     ) {
         parent::__construct([
+                'ref' => $ref ?? Generator::UNDEFINED,
                 'response' => $response ?? Generator::UNDEFINED,
                 'description' => $description ?? Generator::UNDEFINED,
                 'x' => $x ?? Generator::UNDEFINED,