diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 0da0b80..5961c27 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -537,7 +537,7 @@ public function terminate(Request $request, Response $response) {
    * {@inheritdoc}
    */
   public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) {
-    // Ensure sane php environment variables..
+    // Ensure sane PHP environment variables.
     static::bootEnvironment();
 
     try {