diff --git a/toc.org b/toc.org
index c854789..1ef8d7e 100644
--- a/toc.org
+++ b/toc.org
@@ -1,6 +1,7 @@
 #+title: Jumpstart to 2D Game Development: Godot 4.3+ for Beginners
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/godot.css" />
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/org-media-sass/content-overview.css" />
+#+HTML_HEAD: <script src="_share/media/js/org-media-js/collapsible.js"></script>
 
 * Links
 #+attr_html: :class links
@@ -9,6 +10,11 @@
 
 * Contents Overview
 
+** Section 5 - Tappy Plane!
+#+attr_html: :class contents-overview
+- [[./_subsections/sec05/lesson-06.org][Lesson 06 | Plane Movement]]
+
+* obsolete
 ** Section 3 - An intro to Godot with Gem Catcher
 #+attr_html: :class contents-overview
 - [[./_subsections/sec03/lesson-02.org][Lesson 02 | Game Scene]]
@@ -24,7 +30,8 @@
 - [[./_subsections/sec03/lesson-16.org][Lesson 16, 17 | Game Over, Sound / End Game]]
 - [[./_subsections/sec03/lesson-30.org][Lesson 30 | Section Review]]
 
-** obsolete - Section 4 - Tappy Plane!
+** Section 4 - Tappy Plane!
+#+attr_html: :class contents-overview
 - [[./_subsections/sec04/lesson-01.org][Lesson 01 | Project Setup & Aspect Ratios]]
 - [[./_subsections/sec04/lesson-02.org][Lesson 02 | Project Assets & Imports]]
 - [[./_subsections/sec04/lesson-03.org][Lesson 03 | Physics 2D Nodes]]
@@ -32,6 +39,3 @@
 - [[./_subsections/sec04/lesson-05.org][Lesson 05, 06 | Collision Shapes and Resources, Falling]]
 - [[./_subsections/sec04/lesson-07.org][Lesson 07 | Flying]]
 - [[./_subsections/sec04/lesson-08.org][Lesson 08 | Collisions: Hitting the Floor]]
-
-** Section 5 - Tappy Plane!
-- [[./_subsections/sec05/lesson-06.org][Lesson 06 | Plane Movement]]