Update textbook.en.md

5 years ago · 926cc1e35f
1 changed files with 2 additions and 0 deletions
--- 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
 ---