diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/textbook.fr.md
index 2b5e0d8a8..9e46d11c8 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/cylindrical/textbook.fr.md
@@ -6,6 +6,11 @@ visible: false
 
 _Spherical coordinates N3_
 
+!!!! Cours en construction !
+!!!! Imparfiat, incomplet
+!!!! Ne pas publier, ne pas mettre visible
+
+
 #### Coordonnées cylindriques
 
 ##### Définition des coordonnées et domaines de définition