diff --git a/docs/chapter-4/README.md b/docs/chapter-4/README.md
index 4261e71..ee1bf63 100644
--- a/docs/chapter-4/README.md
+++ b/docs/chapter-4/README.md
@@ -1,9 +1,9 @@
 ---
 nav_order: 5
 has_children: true
-permalink: /chapter-2
+permalink: /chapter-4
 ---
-# Chapter 2
+# Chapter 4
 {: .no_toc }
 
 ## Table of contents