diff --git a/core/modules/system/src/Tests/Theme/TwigRegistryLoaderTest.php b/core/modules/system/src/Tests/Theme/TwigRegistryLoaderTest.php
index 431f2c1..59e685a 100644
--- a/core/modules/system/src/Tests/Theme/TwigRegistryLoaderTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigRegistryLoaderTest.php
@@ -35,7 +35,7 @@ protected function setUp() {
   }
 
   /**
-   * Checks to see if a value is a twig template.
+   * Checks to see if a value is a Twig template.
    */
   public function assertTwigTemplate($value, $message = '', $group = 'Other') {
     $this->assertTrue($value instanceof \Twig_Template, $message, $group);