diff --git a/docs/_partials/fields/tab-groups.rst b/docs/_partials/fields/tab-groups.rst
index 5f542c87..4fc9842e 100644
--- a/docs/_partials/fields/tab-groups.rst
+++ b/docs/_partials/fields/tab-groups.rst
@@ -16,5 +16,7 @@ If there are fields which are not listed under any group they will be
 automatically shown under 1st tab with header ``Primary``. You can customize
 the primary group's name using `scaffold.form_primary_tab` config.
 
+.. code-block:: php
+
     $action = $this->Crud->action();
     $action->config('scaffold.form_primary_tab', 'Key Info');