diff -u b/core/modules/system/tests/modules/twig_theme_test/lib/Drupal/twig_theme_test/TwigThemeTestController.php b/core/modules/system/tests/modules/twig_theme_test/lib/Drupal/twig_theme_test/TwigThemeTestController.php
--- b/core/modules/system/tests/modules/twig_theme_test/lib/Drupal/twig_theme_test/TwigThemeTestController.php
+++ b/core/modules/system/tests/modules/twig_theme_test/lib/Drupal/twig_theme_test/TwigThemeTestController.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * @file
  * Contains \Drupal\twig_theme_test\TwigThemeTestController.
@@ -9,9 +10,8 @@
 use Drupal\Core\ControllerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-
 /**
- * Controller routines for book routes.
+ * Controller routines for Twig theme test routes.
  */
 class TwigThemeTestController implements ControllerInterface {
 
@@ -23,7 +23,7 @@
   }
 
   /**
-   * Menu callback for testing php variables in a Twig template.
+   * Menu callback for testing PHP variables in a Twig template.
    */
   public function phpVariablesRender() {
     return theme('twig_theme_test_php_variables');