diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md
index 590eacb4c..335792f50 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md	
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md	
@@ -6,6 +6,8 @@ visible: false
 lessons:
     - slug: mecanique-classique-n2-linear
       order: 2
+    - slug: modern-versus-classical-physics-2
+      order: 2
 ---
 
 #### Mécanique classique, n2, synthèse