diff --git a/core/modules/book/src/BookManager.php b/core/modules/book/src/BookManager.php
index 2e8a944..556350f 100644
--- a/core/modules/book/src/BookManager.php
+++ b/core/modules/book/src/BookManager.php
@@ -541,6 +541,7 @@ protected function buildItems(array $tree) {
     foreach ($tree as $data) {
       $element = [];
 
+      // Generally we only deal with visible links, but just in case.
       if (!$data['link']['access']) {
         continue;
       }
diff --git a/core/themes/classy/templates/navigation/menu.html.twig b/core/themes/classy/templates/navigation/menu.html.twig
index 3ebed26..aa6b469 100644
--- a/core/themes/classy/templates/navigation/menu.html.twig
+++ b/core/themes/classy/templates/navigation/menu.html.twig
@@ -44,7 +44,7 @@
           {{ menus.menu_links(item.below, attributes, menu_level + 1) }}
         {% endif %}
       </li>
-      {% endfor %}
+    {% endfor %}
     </ul>
   {% endif %}
 {% endmacro %}