diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.fr.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.fr.md
index 4bc53bad4..796aaaaec 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.fr.md
@@ -17,7 +17,7 @@ lessons:
 ----------------------------------------------->
 
 
-### Définir les outils mathématiques requis à chaque niveau
+#### Définir les outils mathématiques requis à chaque niveau
 
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