diff --git a/library/Businessprocess/Renderer/TileRenderer/NodeTile.php b/library/Businessprocess/Renderer/TileRenderer/NodeTile.php
index 652ca0e..9bc1c2f 100644
--- a/library/Businessprocess/Renderer/TileRenderer/NodeTile.php
+++ b/library/Businessprocess/Renderer/TileRenderer/NodeTile.php
@@ -37,7 +37,7 @@ class NodeTile extends BaseHtmlElement
      * @param Renderer $renderer
      * @param $name
      * @param Node $node
-     * @param null $path
+     * @param ?array $path
      */
     public function __construct(Renderer $renderer, Node $node, $path = null)
     {