diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1314,8 +1314,8 @@
  * Default template: page.html.twig.
  *
  * Most themes use their own copy of page.html.twig. The default is located
- * inside "core/themes/stable/templates/layout/page.html.twig".
- * Look in there for the full list of variables.
+ * inside "modules/system/page.html.twig". Look in there for the full list of
+ * variables.
  */
 function template_preprocess_page(&$variables) {
   $language_interface = \Drupal::languageManager()->getCurrentLanguage();
@@ -1327,9 +1327,7 @@
  *
  * Default template: page.html.twig.
  *
- * Most themes use their own copy of page.html.twig. The default is located
- * inside "core/themes/stable/templates/layout/page.html.twig".
- * Look in there for the full list of variables.
+ * See the page.html.twig template for list of variables.
  */
 function template_preprocess_page(&$variables) {
   $language_interface = \Drupal::languageManager()->getCurrentLanguage();