diff --git a/core/modules/system/tests/modules/url_alter_test/lib/Drupal/url_alter_test/Controller/URLAlterTestController.php b/core/modules/system/tests/modules/url_alter_test/lib/Drupal/url_alter_test/Controller/URLAlterTestController.php
index e8cc57d..da06222 100644
--- a/core/modules/system/tests/modules/url_alter_test/lib/Drupal/url_alter_test/Controller/URLAlterTestController.php
+++ b/core/modules/system/tests/modules/url_alter_test/lib/Drupal/url_alter_test/Controller/URLAlterTestController.php
@@ -16,6 +16,8 @@ class URLAlterTestController {
   /**
    * Prints Current and Request Path.
    *
+   * @return \Symfony\Component\HttpFoundation\Response
+   *   A response object.
    */
   public function foo() {
     return new Response('current_path=' . current_path() . ' request_path=' . request_path());