diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/cheatsheet.fr.md
index 409869c41..f86370839 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/cheatsheet.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/cheatsheet.fr.md
@@ -10,6 +10,12 @@ visible: false
 !!!! Imparfait, incomplet
 !!!! Ne pas publier, ne pas mettre visible
 
+$`\Longrightarrow`$
+
+**$`\Longrightarrow`$**
+
+**$`\Longrightarrow`$ ceci est un essai.**
+
 #### Que sont les coordonnées cylindriques ?
 
 * 3 coordonnées *spatiales* : **$`\mathbf{\rho\;,\;\varphi\;,\;z}`$**