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 35257c547..5bf2eed0d 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
@@ -6,6 +6,8 @@ visible: false
 lessons:
     - slug: brainstorming-123-classical-mechanics
       order: 2
+    - slug: brainstorming-234-classical-mechanics
+      order: 1
 ---
 
 #### Brainstorming to structure a theme "Classical mechanics" : level 2