From 926cc1e35f5a1d34da9960e930e48983c2ef93df Mon Sep 17 00:00:00 2001
From: Claude Meny <claude.meny@irap.omp.eu>
Date: Mon, 18 Jan 2021 17:16:42 +0100
Subject: [PATCH] Update textbook.en.md

---
 .../20.cartesian-coordinates/10.main/textbook.en.md             | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/12.temporary_ins/05.coordinates-systems/20.cartesian-coordinates/10.main/textbook.en.md b/12.temporary_ins/05.coordinates-systems/20.cartesian-coordinates/10.main/textbook.en.md
index b6bd10cd3..0edf50f04 100644
--- a/12.temporary_ins/05.coordinates-systems/20.cartesian-coordinates/10.main/textbook.en.md
+++ b/12.temporary_ins/05.coordinates-systems/20.cartesian-coordinates/10.main/textbook.en.md
@@ -4,6 +4,8 @@ published: true
 routable: false
 visible: false
 lessons:
+    - slug:
+      order:
     - slug: cartesian-coordinates-linear
       order: 1
 ---