diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
index eaa544d71..42ce04b68 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
@@ -628,7 +628,7 @@ s'écrit de la manière suivante :
 
 $`d\left(\overrightarrow{OM}(t)\right)=d\left|\left|\overrightarrow{OM}(t))_{\perp}\right|\right|
 \cdot \overrightarrow{e_{||}\,+\,\left|\left|\overrightarrow{OM}(t))_{\perp}\right|\right|
-\cdot d\Psi\cdot\overrightarrow{e_{perp}`$
+\cdot d\Psi\cdot\overrightarrow{e_{perp}}`$