diff --git a/12.temporary_ins/65.geometrical-optics/50.simple-elements/20.mirror/30.beyond/annex.en.md b/12.temporary_ins/65.geometrical-optics/50.simple-elements/20.mirror/30.beyond/annex.en.md
index b38ff8530..3ebd77f82 100644
--- a/12.temporary_ins/65.geometrical-optics/50.simple-elements/20.mirror/30.beyond/annex.en.md
+++ b/12.temporary_ins/65.geometrical-optics/50.simple-elements/20.mirror/30.beyond/annex.en.md
@@ -5,6 +5,15 @@ routable: true
visible: false
---
+
+!!!! *LESSON UNDER CONSTRUCTION :*
+!!!! Published but invisible: does not appear in the tree structure of the m3p2.com site. This course is *under construction*, it is *not approved by the pedagogical team* at this stage.
+!!!! Working document intended only for the pedagogical team.
+
+
+
+-----------
+
! *YOUR CHALLENGE* : Your image in a mirror.
!
! 