diff --git a/10.brainstorming-innovative-courses/entropy/n1/10.enumeration/10.main/textbook.en.md b/10.brainstorming-innovative-courses/entropy/n1/10.enumeration/10.main/textbook.en.md
index 470dc70bc..20ad58a7c 100644
--- a/10.brainstorming-innovative-courses/entropy/n1/10.enumeration/10.main/textbook.en.md
+++ b/10.brainstorming-innovative-courses/entropy/n1/10.enumeration/10.main/textbook.en.md
@@ -3,6 +3,10 @@ title: enumeration
 published: true
 routable: true
 visible: true
+lessons:
+   - slug: entropy-linear-n1
+     order: 1
+---
 
 
 Enumeration : main EN
\ No newline at end of file