diff --git a/README.md b/README.md
index b122a55..2d86782 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,24 @@
 ## Install
 
 1. 安裝 [CHIP_IO](https://github.com/xtacocorex/CHIP_IO)。
-   ```bash
-   sudo apt-get update
-   sudo apt-get install git build-essential python3-dev python3-pip flex bison chip-dt-overlays -y
-   sudo pip3 install CHIP-IO
-   ```
 
+```bash
+sudo apt-get update
+sudo apt-get install git build-essential python3-dev python3-pip flex bison chip-dt-overlays -y
+sudo pip3 install CHIP-IO
+```
+
+2. 取得這個專案。
+
+```bash
+git clone https://git.ntut.com.tw/PinLin/door-unlocker/
+```
+
+## Usage
+
+需要以 root 使用者執行。
+
+```bash
+sudo python3 app.py
+```