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.fr.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.fr.md
index 2865e447b..ac1c68c78 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.fr.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.fr.md
@@ -29,7 +29,7 @@ Elle permet  enfin de comprendre comment la lumière peut se propager dans une f
 
  | |
  --- | ---
-*dates* | *en calendrier grégorien (calendrier usuel)*
+*dates* | *en calendrier grégorien (calendrier usuel)*
 <span style="color: #0066cc">&#8226; &#8776; -2500 </span> |  <span style="color: #0066cc">premières fabrications en verre translucide, en Mésopotamie et Égypte.</span>
 <span style="color: #0066cc">&#8226; -2000 à -1000</span> |  <span style="color: #0066cc">divers éléments en quartz volontairement polis</span>
 <span style="color: #0066cc">&#8226; -850 &pm; 150 </span> | <span style="color: #0066cc">la *lentille de Nimrud*, peut-être plus ancien instrument d'optique jamais découvert.</span>