diff --git a/developer_manual/app/css.rst b/developer_manual/app/css.rst
index 7e6e66a83..2a7fa51fe 100644
--- a/developer_manual/app/css.rst
+++ b/developer_manual/app/css.rst
@@ -54,7 +54,7 @@ To create a settings area create a div with the id **app-settings** inside the *
 
             <div id="app-settings">
                 <div id="app-settings-header">
-                    <button class="settings-button"></button>
+                    <button class="settings-button" data-apps-slide-toggle="#app-settings-content"></button>
                 </div>
                 <div id="app-settings-content">
                     <!-- Your settings in here -->