diff --git a/src/Config.php b/src/Config.php
index 8b167fe..5c0870e 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -13,9 +13,9 @@ class Config implements \IteratorAggregate, \Countable
     private $config;
 
     /**
-     * @param $config
+     * @param array $config
      */
-    public function __construct($config)
+    public function __construct(array $config)
     {
         $this->config = $config;
     }