diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/50.n4/30.en/10.main/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/50.n4/30.en/10.main/textbook.fr.md
index 9f81d1738..d7844242d 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/50.n4/30.en/10.main/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/50.n4/30.en/10.main/textbook.fr.md
@@ -9,7 +9,7 @@ lessons:
     - slug: classical-mechanics-234-panorama
       order: 3
     - slug: classical-mechanics-n4-exchange
-      order: 3
+      order: 1
 ---
 
 #### Classical mechanics, n4, main