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 79bea3243..1cde88f16 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
@@ -4,7 +4,7 @@ published : false
 visible : false
 ---
 
-Equations de maxwell
+### Equations de maxwell
 
 $`div \overrightarrow{E} = \dfrac{\rho}{\epsilon_0}`$
 
@@ -15,6 +15,7 @@ $`div \overrightarrow{B} = 0`$
 $`\overrightarrow{rot} \;\overrightarrow{B} = \mu_0\;\overrightarrow{j} +
 \mu_0 \epsilon_0 \;\dfrac{\partial \overrightarrow{j}}{\partial t}`$
 
+### Propagation du champ électromagnétique dans le vide
 
 $`\overrightarrow{rot}\,\overrightarrow{E}=-\dfrac{\partial \overrightarrow{B}}{\partial t}`$