diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/40.n4/10.brainstorming/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/40.n4/10.brainstorming/textbook.en.md
index ad73f1b33..53ec6ef22 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/40.n4/10.brainstorming/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/40.n4/10.brainstorming/textbook.en.md
@@ -16,4 +16,6 @@ This level 4 brainstorming can be seen in its multilingual version at:
 
 https://m3p2.com/polyglot/brainstorming-pedagogical-teams/synthesis-structuring/classical-mechanics/n4/brainstorming
 
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+----------------------------------------
+
+### Brainstorming
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