diff --git a/01.m3p2-curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/03.N3_theme_1_chap2-4/01.reflexion-refraction-ray-tracing/textbook.en.md b/01.m3p2-curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/03.N3_theme_1_chap2-4/01.reflexion-refraction-ray-tracing/textbook.en.md
index 4375998cd..d2d6c3736 100644
--- a/01.m3p2-curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/03.N3_theme_1_chap2-4/01.reflexion-refraction-ray-tracing/textbook.en.md
+++ b/01.m3p2-curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/03.N3_theme_1_chap2-4/01.reflexion-refraction-ray-tracing/textbook.en.md
@@ -4,6 +4,7 @@ title: 'laws of reflexion and refraction, and associated phenomena'
 
 #### course to build
 
+<!--
 ##### visible comment
 
 There, to see. The laws of the reflection and the refraction were correctly expressed at the previous level, with beautiful gif in the part(party) F. Thus in priori, possibly a link towards this specific page of the lower level (hill). And as a result, in N-1 we shall call the level even lower (plain).
@@ -14,4 +15,5 @@ Then, it is already necessary to introduce the ray-tracing. Which(who) will be b
 
 And it is best (?) that one can make in geometrical optics. Because later, we are going to go farther with him(her,it) " oprique geometrical paraxiale ", but it is the "idealized image" which allows to visialiser, to plan, to size much more. But as it is an idealized image, then there is écarts with the reality, which are called the aberrations. (Not, it is a little more, the aberrations). To speak about aberration in the geometrical optics with the only laws of the reflection and about the refraction, really has no sense(direction). To reflect as build it :)
 
-**It is also possible to propose a change in the structure of chapters and sub-chapters**
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+**It is also possible to propose a change in the structure of chapters and sub-chapters**
+-->
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