Update annex.en.md

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 :* <br>
+!!!! 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. <br>
+!!!! Working document intended only for the pedagogical team.
+
+<!--MetaData : ... -->
+
+-----------
+
 ! *YOUR  CHALLENGE*  :  Your image in a mirror.
 ! 
 !  ![](objet_image_defi_v2_300.jpg)