diff --git a/README-zh.md b/README-zh.md
index 9e15a91..68c56af 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -75,7 +75,7 @@ sudo sh vpnsetup_centos.sh
 
 **iPhone/iPad 用户**: 在 iOS 的设置菜单请选择 `L2TP` (而不是 `IPSec`) 作为 VPN 类型。
 
-如果要创建具有不同凭据的多个 VPN 用户，只需要<a href="https://gist.github.com/hwdsl2/123b886f29f4c689f531" target="_blank">修改这几行的脚本</a>。
+如果要创建具有不同凭据的多个 VPN 用户，只需要<a href="docs/enable-multiple-users.txt" target="_blank">修改这几行的脚本</a>。
 
 在 VPN 已连接时，客户端配置为使用 <a href="https://developers.google.com/speed/public-dns/" target="_blank">Google Public DNS</a>。此设置可在 `options.xl2tpd` 文件的 `ms-dns` 项更改。
 
diff --git a/README.md b/README.md
index 3108ff5..e3ae50e 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ For **Windows users**, a <a href="https://documentation.meraki.com/MX-Z/Client_V
 
 **iPhone/iPad users**: In iOS settings, choose `L2TP` (instead of `IPSec`) as the VPN type.
 
-To enable multiple VPN users with different credentials, just <a href="https://gist.github.com/hwdsl2/123b886f29f4c689f531" target="_blank">edit a few lines</a> in the scripts.
+To enable multiple VPN users with different credentials, just <a href="docs/enable-multiple-users.txt" target="_blank">edit a few lines</a> in the scripts.
 
 Clients are configured to use <a href="https://developers.google.com/speed/public-dns/" target="_blank">Google Public DNS</a> when the VPN is active. To change, set `ms-dns` in `options.xl2tpd`.
 
diff --git a/docs/enable-multiple-users.txt b/docs/enable-multiple-users.txt
new file mode 100644
index 0000000..b18d948
--- /dev/null
+++ b/docs/enable-multiple-users.txt
@@ -0,0 +1,21 @@
+To enable multiple VPN users with different credentials, find and replace these lines in the script:
+
+cat > /etc/ppp/chap-secrets <<EOF
+# Secrets for authentication using CHAP
+# client server secret IP addresses
+"$VPN_USER" l2tpd "$VPN_PASSWORD" *
+EOF
+
+with the following:
+
+cat > /etc/ppp/chap-secrets <<EOF
+"user1"  l2tpd  "password1"  *
+"user2"  l2tpd  "password2"  *
+EOF
+
+-----------------
+ IMPORTANT NOTES
+-----------------
+1. Make sure there is NO SPACE after both EOF above!
+2. This example shows user1 with password1, and user2 with password2. You can add more users, use one line for each user.
+3. The characters \ and " within your username/password MUST be escaped as \\ and \", respectively.