Nesting hastag

README.md

@@ -5,14 +5,14 @@ The old Linux kernel source ver 0.11 which has been tested under modern Linux,
 
 ## 1. Build on Linux
 
-## 1.1. Linux Setup
+### 1.1. Linux Setup
 
 * a linux distribution: debian , ubuntu and mint are recommended
 * some tools: gcc gdb qemu
 * a linux-0.11 hardware image file: hdc-0.11.img, please download it from http://www.oldlinux.org, or http://mirror.lzu.edu.cn/os/oldlinux.org/, ant put it in the root directory.
 * Now, This version already support the Ubuntu 16.04, enjoy it.
 
-## 1.2. hack linux-0.11
+### 1.2. hack linux-0.11
 ```bash
 $ make help		// get help
 $ make  		// compile
@@ -28,7 +28,7 @@ $ gdb tools/system
 
 ## 2. Build on Mac OS X
 
-## 2.1. Mac OS X Setup
+### 2.1. Mac OS X Setup
 
 * install cross compiler gcc and binutils
 * install qemu
@@ -49,7 +49,7 @@ $ ./configure --target=i386-elf
 $ make
 ```
 
-## 2.2. hack linux-0.11
+### 2.2. hack linux-0.11
 same as section 1.2