diff --git a/lib/Exar/Autoloader.php b/lib/Exar/Autoloader.php
index a522647..96fca23 100644
--- a/lib/Exar/Autoloader.php
+++ b/lib/Exar/Autoloader.php
@@ -16,7 +16,7 @@ class Autoloader {
     /**
      * Registers this autoloader on the autoloader queue.
      *
-     * @param $cacheDir the path to cache directory
+     * @param string $cacheDir the path to cache directory
      * @param array $namespaces array with nmespaces to be loaded with this autoloader
      * @param bool $prepend if true, this autoloader will be prepended on the autoload queue, otherwise it is appended
      */
@@ -119,4 +119,4 @@ static public function cleanCache() {
         array_map('unlink', glob(self::$cacheDir . '/*'));
     }
 
-}
\ No newline at end of file
+}