diff --git a/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/04.electromagnetism-in-media/03.reflexion-refraction/01.reflexion-refraction-main/textbook.en.md b/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/04.electromagnetism-in-media/03.reflexion-refraction/01.reflexion-refraction-main/textbook.en.md
index 1c77a1f57..179031ee8 100644
--- a/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/04.electromagnetism-in-media/03.reflexion-refraction/01.reflexion-refraction-main/textbook.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/04.electromagnetism-in-media/03.reflexion-refraction/01.reflexion-refraction-main/textbook.en.md
@@ -1,6 +1,6 @@
 ---
 title : en construction
-published :true
+published : true
 visible : true
 ---