diff --git a/12.temporary_ins/25.conductors-stationary_fields/20.overview/cheatsheet.en.md b/12.temporary_ins/25.conductors-stationary_fields/20.overview/cheatsheet.en.md
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+---
+title: Conductive media in stationary electric and magnetic fields
+published: true
+routable: true
+visible: false
+lessons:
+  - slug: conductor-dielectric-magnetic-media-in-static-fields
+    order: 1
+---
+
+!!!! *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 : ... -->
+
+### Conductive media in stationary electric and magnetic fields
\ No newline at end of file