diff --git a/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php b/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php
index d1029ef..d64d304 100644
--- a/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php
+++ b/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php
@@ -20,11 +20,11 @@
  * public function on404(GetResponseForExceptionEvent $event) {}
  * @endcode
  *
- * To implement a fallback for the entire 4XX class of codes, implement the
+ * To implement a fallback for the entire 4xx class of codes, implement the
  * method:
  *
  * @code
- * public function on4XX(GetResponseForExceptionEvent $event) {}
+ * public function on4xx(GetResponseForExceptionEvent $event) {}
  * @endcode
  *
  * That method should then call $event->setResponse() to set the response object