diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/04.stigmatism and conjugate-points/topic.en.md b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/04.stigmatism and conjugate-points/topic.en.md
index 2abfa3ea0..f4e60a9d8 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/04.stigmatism and conjugate-points/topic.en.md	
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/04.stigmatism and conjugate-points/topic.en.md	
@@ -1,5 +1,6 @@
 ---
 title: 'Objects et images in geometrical optics'
+published: false
 ---
 
 #### course to build