diff --git a/AccessTokenInterface.php b/AccessTokenInterface.php
index 8ffa8b6..063b7fa 100644
--- a/AccessTokenInterface.php
+++ b/AccessTokenInterface.php
@@ -16,4 +16,9 @@ public function getToken();
      * @return integer|null
      */
     public function getUserId();
+
+    /**
+     * @return integer|null
+     */
+    public function getExpires();
 }