diff --git a/ch04/README.md b/ch04/README.md
index 3608be2..5891b2d 100644
--- a/ch04/README.md
+++ b/ch04/README.md
@@ -4,7 +4,7 @@
 
 - [01_main-chapter-code](01_main-chapter-code) contains the main chapter code.
 
-## ### Optional Code
+## Optional Code
 
 - [02_performance-analysis](02_performance-analysis) contains optional code analyzing the performance of the GPT model(s) implemented in the main chapter.