diff --git a/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.fr.md b/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.fr.md
index 1a4991f52..c7a795445 100644
--- a/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.fr.md
+++ b/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.fr.md
@@ -8,6 +8,8 @@ lessons:
       order:
     - slug: cylindrical-coordinates-linear
       order: 1 
+    - slug: cylindrical-coordinates-exchange-FR_ES
+      order: 1
 ---
 
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