diff --git a/tools/modelGraph.php b/tools/modelGraph.php
index 1f4eaab..8cff261 100755
--- a/tools/modelGraph.php
+++ b/tools/modelGraph.php
@@ -24,6 +24,8 @@ class modelgraph
 
   /** The constructor wait for $dsn
     * @param string $dsn The DSN to connect to database
+    * @param string $username The username to connect to database
+    * @param string $password The password to connect to database
     * @param string $output The output file to generate
     */
   public function __construct ($dsn, $username, $password, $output)