diff --git a/docs/examples/UploadFilenameListener.md b/docs/examples/UploadFilenameListener.md
index 0ab7c8d..bcb6e0e 100644
--- a/docs/examples/UploadFilenameListener.md
+++ b/docs/examples/UploadFilenameListener.md
@@ -1,3 +1,4 @@
+```php
 <?php
 
 /**
@@ -72,3 +73,4 @@ class UploadFilenameListener implements EventListenerInterface
         return $path;
     }
 }
+```