diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/40.n4/20.overview/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/40.n4/20.overview/cheatsheet.fr.md
index 55bff3134..bb14c3ad4 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/40.n4/20.overview/cheatsheet.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/40.n4/20.overview/cheatsheet.fr.md
@@ -3,6 +3,9 @@ title: Les relativités niveau 4
 published: true
 routable: true
 visible: false
+lessons:
+    - slug: relativity-linear-4
+      order: 2
 ---
 
 Les relativités niveau 4, overview
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