diff --git a/src/ClientRepository.php b/src/ClientRepository.php
index 402deb057..2809b3ae1 100644
--- a/src/ClientRepository.php
+++ b/src/ClientRepository.php
@@ -158,7 +158,7 @@ public function create($userId, $name, $redirect, $provider = null, $personalAcc
     /**
      * Store a new personal access token client.
      *
-     * @param  int  $userId
+     * @param  int|null  $userId
      * @param  string  $name
      * @param  string  $redirect
      * @return \Laravel\Passport\Client
@@ -175,7 +175,7 @@ public function createPersonalAccessClient($userId, $name, $redirect)
     /**
      * Store a new password grant client.
      *
-     * @param  int  $userId
+     * @param  int|null  $userId
      * @param  string  $name
      * @param  string  $redirect
      * @param  string|null  $provider