diff --git a/src/Composer/Repository/Vcs/VcsDriver.php b/src/Composer/Repository/Vcs/VcsDriver.php
index f6d428802..84b209bd3 100644
--- a/src/Composer/Repository/Vcs/VcsDriver.php
+++ b/src/Composer/Repository/Vcs/VcsDriver.php
@@ -101,6 +101,11 @@ abstract class VcsDriver implements VcsDriverInterface
         return $this->remoteFilesystem->getContents($this->originUrl, $url, false);
     }
 
+    /**
+     * Return if current repository url is local
+     * 
+     * @return boolean Repository url is local
+     */
     protected static function isLocalUrl($url)
     {
         return (bool) preg_match('{^(file://|/|[a-z]:[\\\\/])}i', $url);