diff --git a/core/modules/views/src/Plugin/views/access/AccessPluginBase.php b/core/modules/views/src/Plugin/views/access/AccessPluginBase.php
index 06a5798..10ce3a3 100644
--- a/core/modules/views/src/Plugin/views/access/AccessPluginBase.php
+++ b/core/modules/views/src/Plugin/views/access/AccessPluginBase.php
@@ -60,6 +60,12 @@ public function summaryTitle() {
    *   The route to change.
    */
   public function alterRouteDefinition(Route $route) {
+    // Views access plugins can change through configuration whether a user has
+    // access to a resource or not, so we have to add a cache tag on the route
+    // in order to allow cache tag invalidation to clear the page cache for this
+    // view (e.g. when a 403 views resource is cached for a subset of users and
+    // the access plugin configuration is changed, the cached 403 output has to
+    // be invalidated).
     $route->setOption('cache_tags', $this->view->storage->getCacheTags());
   }