diff --git a/01.curriculum/02.mathematic/01.niv1/topic.en.md b/01.curriculum/02.mathematic/01.niv1/topic.en.md
index 463bb02f9..92821f531 100644
--- a/01.curriculum/02.mathematic/01.niv1/topic.en.md
+++ b/01.curriculum/02.mathematic/01.niv1/topic.en.md
@@ -1,6 +1,7 @@
 ---
-title: plains
+title: ' plains'
 published: true
-visible: true
+routable: false
+visible: false
 ---