diff -u b/core/modules/page_cache/src/EventSubscriber/ConfigSubscriber.php b/core/modules/page_cache/src/EventSubscriber/ConfigSubscriber.php
--- b/core/modules/page_cache/src/EventSubscriber/ConfigSubscriber.php
+++ b/core/modules/page_cache/src/EventSubscriber/ConfigSubscriber.php
@@ -8,8 +8,7 @@
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
- * Invalidates the '4xx-response' cache tag if the max-age for 4xx responses
- * was changed.
+ * Invalidates the '4xx-response' cache tag when the max-age for 4xx changes.
  */
 class ConfigSubscriber implements EventSubscriberInterface {