diff --git a/core/modules/system/src/Controller/CsrfController.php b/core/modules/system/src/Controller/CsrfController.php
index 1493a26..cd41b00 100644
--- a/core/modules/system/src/Controller/CsrfController.php
+++ b/core/modules/system/src/Controller/CsrfController.php
@@ -14,7 +14,7 @@
 use Symfony\Component\HttpFoundation\Request;
 
 /**
- *
+ * Responds to requests for a user CSRF tokens.
  */
 class CsrfController implements ContainerInjectionInterface {
 
@@ -48,6 +48,7 @@ public static function create(ContainerInterface $container) {
    * Returns a JSON response containing CSRF tokens for a user.
    *
    * @return \Symfony\Component\HttpFoundation\JsonResponse
+   *   The JSON response.
    */
   public function tokens(Request $request) {
     $data = [];