diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md
index e271bfef0..3966496a7 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md
@@ -3,6 +3,9 @@ title: les relativités niveau 1
 published: true
 routable: true
 visible: false
+lesson:
+    - slug: modern-versus-classical-physics-1
+      order: 1
 ---
 
 Les relativités niveau 1 : overview
\ No newline at end of file