diff --git a/src/ZM/MySQL/MySQLWrapper.php b/src/ZM/MySQL/MySQLWrapper.php
index 61074261..ba010ada 100644
--- a/src/ZM/MySQL/MySQLWrapper.php
+++ b/src/ZM/MySQL/MySQLWrapper.php
@@ -20,6 +20,7 @@ use ZM\Exception\DbException;
 
 class MySQLWrapper
 {
+    /** @var Connection */
     private $connection;
 
     /**