diff --git a/README.md b/README.md
index 875c321..96e8138 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 ![CryptoZombies](https://user-images.githubusercontent.com/13703497/69648502-c8f3db80-10ae-11ea-9d52-ce4d4bbc426a.jpeg)
 
 
-## Overview
+## Overview 1
 This repository contains source codes for [Cryptozombies](https://cryptozombies.io/en/) lessons.
 
 The source codes are divided into `courses` and `chapters` as folders and chapters contain Solidity sample codes for each `lesson`.