diff --git a/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/cheatsheet.fr.md b/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/cheatsheet.fr.md
index 821ffe110..9356220a1 100644
--- a/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/cheatsheet.fr.md
+++ b/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/cheatsheet.fr.md
@@ -9,7 +9,7 @@ visible: false
 <!------
 lessons:
    - slug: simple-optical-elements
-   - order: 1
+     order: 1
 ------->
 
 !!!! *COURS EN CONSTRUCTION :* <br>