diff --git a/core/lib/Drupal/Core/Form/ConfigFormBase.php b/core/lib/Drupal/Core/Form/ConfigFormBase.php
index c2f83fa..fb508f8 100644
--- a/core/lib/Drupal/Core/Form/ConfigFormBase.php
+++ b/core/lib/Drupal/Core/Form/ConfigFormBase.php
@@ -41,7 +41,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#button_type' => 'primary',
     );
 
-    // By default, render the form using theme_system_config_form().
+    // By default, render the form using system-config-form.html.twig.
     $form['#theme'] = 'system_config_form';
 
     return $form;