diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/01.geometrical-optics-general/01.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/cheatsheet.en.md b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/01.geometrical-optics-general/01.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/cheatsheet.en.md
index 0bded7ebc..5df31b9de 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/01.geometrical-optics-general/01.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/cheatsheet.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/01.geometrical-optics-general/01.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/cheatsheet.en.md
@@ -34,7 +34,8 @@ Finally, it allows us to understand how light can propagate in an optical fiber,
 
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