diff --git a/core/themes/bartik/bartik.theme b/core/themes/bartik/bartik.theme
index b508cb8..6245b4d 100644
--- a/core/themes/bartik/bartik.theme
+++ b/core/themes/bartik/bartik.theme
@@ -78,7 +78,7 @@ function bartik_process_page(&$variables) {
 }
 
 /**
- * Implements hook_preprocess_HOOK() for maintenance-page.html.twig.
+ * Implements hook_preprocess_HOOK() for maintenance-page.tpl.php.
  */
 function bartik_preprocess_maintenance_page(&$variables) {
   // By default, site_name is set to Drupal if no db connection is available
@@ -92,7 +92,7 @@ function bartik_preprocess_maintenance_page(&$variables) {
 }
 
 /**
- * Implements hook_process_HOOK() for maintenance-page.html.twig.
+ * Implements hook_process_HOOK() for maintenance-page.tpl.php.
  */
 function bartik_process_maintenance_page(&$variables) {
   $site_config = config('system.site');
diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index 0360b6e..61212fe 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -6,12 +6,12 @@
  */
 
 /**
- * Implements hook_preprocess_HOOK() for maintenance-page.html.twig.
+ * Implements hook_preprocess_HOOK() for maintenance-page.tpl.php.
  */
 function seven_preprocess_maintenance_page(&$vars) {
   // While markup for normal pages is split into page.tpl.php and html.tpl.php,
   // the markup for the maintenance page is all in the single
-  // maintenance-page.html.twig template. So, to have what's done in
+  // maintenance-page.tpl.php template. So, to have what's done in
   // seven_preprocess_html() also happen on the maintenance page, it has to be
   // called here.
   seven_preprocess_html($vars);