diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/classical-mechanics/n2/10.brainstorming/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/classical-mechanics/n2/10.brainstorming/textbook.en.md
index 5bf2eed0d..28ff190bd 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/classical-mechanics/n2/10.brainstorming/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/classical-mechanics/n2/10.brainstorming/textbook.en.md
@@ -7,7 +7,7 @@ lessons:
     - slug: brainstorming-123-classical-mechanics
       order: 2
     - slug: brainstorming-234-classical-mechanics
-      order: 1
+      order: 2
 ---
 
 #### Brainstorming to structure a theme "Classical mechanics" : level 2