diff --git a/core/lib/Drupal/Core/Access/CsrfTokenGenerator.php b/core/lib/Drupal/Core/Access/CsrfTokenGenerator.php
index 7f08651..083dd6c 100644
--- a/core/lib/Drupal/Core/Access/CsrfTokenGenerator.php
+++ b/core/lib/Drupal/Core/Access/CsrfTokenGenerator.php
@@ -38,6 +38,8 @@ class CsrfTokenGenerator {
    *
    * @param \Drupal\Core\PrivateKey $private_key
    *   The private key service.
+   * @param \Drupal\Core\Session\MetadataBag $session_metadata
+   *   The session metadata bag.
    */
   public function __construct(PrivateKey $private_key, MetadataBag $session_metadata) {
     $this->privateKey = $private_key;