diff --git a/developer_manual/core/theming.rst b/developer_manual/core/theming.rst
index 8f4cde111..8b54b7925 100644
--- a/developer_manual/core/theming.rst
+++ b/developer_manual/core/theming.rst
@@ -37,6 +37,7 @@ Depending on how you created your new theme it will be necessary to
 
 * put a new theme into the /themes -folder. The theme can be activated by putting ``'theme' => 'MyTheme'``, into the ``/config/config.php`` file.
 * make your changes in the ``/themes/MyTheme`` -folder
+* make sure that the theming app is disabled
 
 
 Structure