diff --git a/docs/details/base-widget/obj.rst b/docs/details/base-widget/obj.rst
index 7946f607f..39e4ada02 100644
--- a/docs/details/base-widget/obj.rst
+++ b/docs/details/base-widget/obj.rst
@@ -191,7 +191,18 @@ outside will not be visible.
 
 This behavior can be overwritten with
 :cpp:expr:`lv_obj_add_flag(widget, LV_OBJ_FLAG_OVERFLOW_VISIBLE)` which allow the
-children to be drawn out of the parent.
+children to be drawn out of the parent. In addition to this, you must register
+the following event callback (this was not required in previous versions).
+
+Note: ``ext_width`` should be the maximum absolute width the children will be
+drawn within.
+
+.. code-block:: c
+
+    static void ext_draw_size_event_cb(lv_event_t * e)
+    {
+        lv_event_set_ext_draw_size(e, 30); /*Set 30px extra draw area around the widget*/
+    }
 
 Create and delete Widgets
 -------------------------