diff --git a/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/RearrangeFilter.php b/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/RearrangeFilter.php
index 58430c9..8a217fe 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/RearrangeFilter.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/RearrangeFilter.php
@@ -206,7 +206,9 @@ public function buildForm(array $form, array &$form_state) {
       );
     }
 
-    // Get form path
+    // Views provides its own custom handling of AJAX form submissions. Usually
+    // this happens at the same path, but custom paths may be specified in
+    // $form_state.
     $form_path = empty($form_state['path']) ? current_path() : $form_state['path'];
 
     $view->getStandardButtons($form, $form_state, 'views_ui_rearrange_filter_form');