diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/20.n2/10.brainstorming/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/20.n2/10.brainstorming/textbook.en.md
index a0641c510..f81e451ff 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/20.n2/10.brainstorming/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/20.n2/10.brainstorming/textbook.en.md
@@ -4,7 +4,7 @@ published: true
 routable: true
 visible: false
 lessons:
-    - slug: brainstorming-123-classical-mechanics
+    - slug: brainstorming-g12-classical-mechanics
       order: 2
     - slug: brainstorming-234-classical-mechanics
       order: 1