diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/20.n2/20.overview/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/20.n2/20.overview/cheatsheet.fr.md
index 65be156bf..67ac8a71e 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/20.n2/20.overview/cheatsheet.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/20.n2/20.overview/cheatsheet.fr.md
@@ -3,6 +3,9 @@ title: les relativités niveau 2
 published: true
 routable: true
 visible: false
+lessons:
+    - slug: modern-versus-classical-physics-2
+      order: 2
 ---
 
 Les relativités niveau 2 : overview
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