diff --git a/page_creation.rst b/page_creation.rst
index d0f7a40e6bc..901c25a3e5b 100644
--- a/page_creation.rst
+++ b/page_creation.rst
@@ -43,6 +43,7 @@ Suppose you want to create a page - ``/lucky/number`` - that generates a lucky (
 random) number and prints it. To do that, create a "Controller class" and a
 "controller" method inside of it::
 
+    <?php
     // src/Controller/LuckyController.php
     namespace App\Controller;