diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/topic.en.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/topic.en.md
index 62f642fd5..64af4d06b 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/topic.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/topic.en.md
@@ -1,4 +1,7 @@
 ---
 title: 'Paraxial geometrical optics (or Gaussian optics) '
+published: true
+routable: true
+visible: false
 ---