diff --git a/Storage/StorageInterface.php b/Storage/StorageInterface.php
index 714ac135..2d098f91 100644
--- a/Storage/StorageInterface.php
+++ b/Storage/StorageInterface.php
@@ -25,4 +25,9 @@ interface StorageInterface
      * Remove all notifications from the storage
      */
     public function clear();
+
+    /**
+     * @param Envelope|Envelope[] $envelopes
+     */
+    public function update($envelopes);
 }