diff --git a/src/Redis.php b/src/Redis.php
index b60dc8e..ea36f97 100644
--- a/src/Redis.php
+++ b/src/Redis.php
@@ -1855,7 +1855,7 @@ public function sGetMembers($key)
      *
      * @param string $key      The set to search.
      * @param int    $iterator LONG (reference) to the iterator as we go.
-     * @param null   $pattern  String, optional pattern to match against.
+     * @param string   $pattern  String, optional pattern to match against.
      * @param int    $count    How many members to return at a time (Redis might return a different amount)
      *
      * @return array|bool PHPRedis will return an array of keys or FALSE when we're done iterating