diff --git a/src/Index/Index.php b/src/Index/Index.php
index 9cb975e..6f95a4b 100644
--- a/src/Index/Index.php
+++ b/src/Index/Index.php
@@ -210,7 +210,6 @@ class Index implements ReadableIndex, \Serializable
     }
 
     /**
-     * @param string $serialized
      * @return string
      */
     public function serialize()