diff --git a/docs/en/02_Developer_Guides/05_Extending/04_Shortcodes.md b/docs/en/02_Developer_Guides/05_Extending/04_Shortcodes.md
index bbc02fdf5..f9e654e62 100644
--- a/docs/en/02_Developer_Guides/05_Extending/04_Shortcodes.md
+++ b/docs/en/02_Developer_Guides/05_Extending/04_Shortcodes.md
@@ -63,7 +63,7 @@ class Page extends SiteTree
         'MyShortCodeMethod' => 'HTMLText'
     ];
 
-    public static function MyShortCodeMethod($arguments, $content = null, $parser = null, $tagName) 
+    public static function MyShortCodeMethod($arguments, $content = null, $parser = null, $tagName = null) 
     {
         return "<em>" . $tagName . "</em> " . $content . "; " . count($arguments) . " arguments.";
     }