diff --git a/README.md b/README.md
index e5b7a6c..f4377fd 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ $ sudo systemctl status nginx # 查看 nginx 是否啟動
 $ sudo systemctl restart nginx # 安全重啟 nginx，若已啟動則可跳過此步驟
 $ cd /etc/nginx/
 $ sudo mkdir orbit_sites/
-$ vim nginx.conf # add `include /etc/nginx/orbit_sites/*;` to Virtual Host Configs block
+$ sudo vim nginx.conf # add `include /etc/nginx/orbit_sites/*;` to Virtual Host Configs block
 $ sudo vim orbit_sites/xxx_ooo # 建立網站 nginx 設定檔，xxx 為學校縮寫，ooo 為系所、單位縮寫。內容參考附註 nginx 設定檔
 ```
 ```nginx
@@ -89,7 +89,7 @@ $ sudo apt install gnupg2
 $ gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
 $ \curl -sSL https://get.rvm.io | bash -s stable
 $ source /home/rulingcom/.rvm/scripts/rvm
-# $ sudo sudo vi /etc/apt/sources.list # Ubuntu 20.04LTS add `deb http://security.ubuntu.com/ubuntu bionic-security main`
+$ sudo vi /etc/apt/sources.list # Ubuntu 20.04LTS add `deb http://security.ubuntu.com/ubuntu bionic-security main`
 $ rvm install 2.1.2
 $ rvm install 2.1.10
 $ rvm --default use 2.1.10