diff --git a/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/02.electromagnetic-waves-vacuum/02.electromagnetic-waves-vacuum-main/textbook.fr.md b/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/02.electromagnetic-waves-vacuum/02.electromagnetic-waves-vacuum-main/textbook.fr.md
index f8370abf4..c916e5e47 100644
--- a/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/02.electromagnetic-waves-vacuum/02.electromagnetic-waves-vacuum-main/textbook.fr.md
+++ b/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/02.electromagnetic-waves-vacuum/02.electromagnetic-waves-vacuum-main/textbook.fr.md
@@ -303,7 +303,7 @@ sens de propagation* de l'onde,<br> et *$`k`$*$`=||k||`$ est le
 ---------------------------
 Propriétés de l'onde EM plane progressive monochromatique dans le vide :
 
-* **$`\overrightarrow{k}\land\overrightarrow{E}=\omega\overrightarrow{B}**<br>
+* **$`\overrightarrow{k}\land\overrightarrow{E}=\omega\overrightarrow{B}`$**<br>
 <br>
 $`\Longrightarrow`$ (\overrightarrow{k},\overrightarrow{E},\overrightarrow{B}) forment un trièdre direct.<br>
 <br>