diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index dd97a01..4bd9308 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -172,9 +172,9 @@
   "active": "26919eaeae9a8f38",
   "lastOpenFiles": [
     "Algo/Courses/Chapter 6 - Lists (Exercises).md",
+    "Algo/Courses/Chapter 6 - Lists.md",
     "Algo/Séminaire/Chapter 1 - CAML basics.md",
     "Prog/Loops.md",
-    "Algo/Courses/Chapter 6 - Lists.md",
     "Algo/Séminaire/Chapter 5 - Recursivity.md",
     "Algo/Séminaire/Chapter 4 - A bit of imperative.md",
     "Algo/Séminaire/Chapter 3 - Case analysis.md",
diff --git a/Algo/Courses/Chapter 6 - Lists.md b/Algo/Courses/Chapter 6 - Lists.md
index 3f40438..7f76b79 100644
--- a/Algo/Courses/Chapter 6 - Lists.md	
+++ b/Algo/Courses/Chapter 6 - Lists.md	
@@ -144,4 +144,7 @@ val what : int -> int list = <fun>
 # what 3;;
 ```
 
+### Reverse
+<img src="https://media.cleanshot.cloud/media/72873/OsuaEVYxMSlXPwyMbR6OBDPPfl1WOZZlJVuGXOeB.jpeg?Expires=1697477902&Signature=ILwYNR152n~xfEMrVa5Lw~pn3kR91fc-MnDYGOxHrZ-ZanfvPHxa~ndgkHuuXrzVbgkhgyR431DZAF1hz21Er-94LFxC7BnwUke9xosc9Xx5XPl13RCPavWoLHWwf-v~TjtUhQ9y796vDMEVgKPqfPlDpexVDHLLzn~CvBXRoR3b8BzORGwrw2nYNgKIUGZ0qBYwwfW2l7nQRoLwf0D6PdxTzSMhMiDd1Kkxnk3ZOOV~GPzvIeaLl6EEEoIXHvbnvq27iiZwCDOAs9sO61n4hZCqeh9GnrgmEJhFfaxO2Nzv1m71bcnxEjpXEWa3GeeMGu3-lxA6eAjuLIBEq2JleQ__&Key-Pair-Id=K269JMAT9ZF4GZ" />
 ### Complexity
+<center><iframe width="560" height="315" src="https://www.youtube.com/embed/KXAbAa1mieU?si=cbLGc2y64N87Rv_z" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe></center>