diff --git a/core/lib/Drupal/Core/Template/TwigExtension.php b/core/lib/Drupal/Core/Template/TwigExtension.php
index 29d34f3..9d3ecd3 100644
--- a/core/lib/Drupal/Core/Template/TwigExtension.php
+++ b/core/lib/Drupal/Core/Template/TwigExtension.php
@@ -232,7 +232,7 @@ public function getName() {
    * @see \Drupal\Core\Routing\UrlGeneratorInterface::generateFromRoute()
    */
   public function getPath($name, $parameters = [], $options = []) {
-    assert('$this->urlGenerator instanceof \Drupal\Core\Routing\UrlGeneratorInterface', 'The URL Generator hasn\'t been set up. Any configuration YAML file with a service directive dealing with the twig configuration can cause this, most likely found in a recently installed or changed module.');
+    assert('$this->urlGenerator instanceof \Drupal\Core\Routing\UrlGeneratorInterface', 'The URL generator hasn\'t been set up. Any configuration YAML file with a service directive dealing with the Twig configuration can cause this, most likely found in a recently installed or changed module.');
     $options['absolute'] = FALSE;
     return $this->urlGenerator->generateFromRoute($name, $parameters, $options);
   }
@@ -254,7 +254,7 @@ public function getPath($name, $parameters = [], $options = []) {
    * @todo Add an option for scheme-relative URLs.
    */
   public function getUrl($name, $parameters = [], $options = []) {
-    assert('$this->urlGenerator instanceof \Drupal\Core\Routing\UrlGeneratorInterface', 'The URL Generator hasn\'t been set up. Any configuration YAML file with a service directive dealing with the twig configuration can cause this, most likely found in a recently installed or changed module.');
+    assert('$this->urlGenerator instanceof \Drupal\Core\Routing\UrlGeneratorInterface', 'The URL generator hasn\'t been set up. Any configuration YAML file with a service directive dealing with the Twig configuration can cause this, most likely found in a recently installed or changed module.');
 
     // Generate URL.
     $options['absolute'] = TRUE;
@@ -280,8 +280,8 @@ public function getUrl($name, $parameters = [], $options = []) {
    *   A render array representing a link to the given URL.
    */
   public function getLink($text, $url, $attributes = []) {
-    assert('is_string($url) || $url instanceof \Drupal\Core\Url', 'Argument #2 must be a string or object of type \Drupal\Core\Url');
-    assert('is_array($attributes) || $attributes instanceof \Drupal\Core\Template\Attribute', 'Argument #3, if set, must be an array or object of type \Drupal\Core\Template\Attribute');
+    assert('is_string($url) || $url instanceof \Drupal\Core\Url', '$url must be a string or object of type \Drupal\Core\Url');
+    assert('is_array($attributes) || $attributes instanceof \Drupal\Core\Template\Attribute', '$attributes, if set, must be an array or object of type \Drupal\Core\Template\Attribute');
 
     if (!$url instanceof Url) {
       $url = Url::fromUri($url);