diff --git a/docs/advanced-usage-zh.md b/docs/advanced-usage-zh.md
index ebae5f7..100d986 100644
--- a/docs/advanced-usage-zh.md
+++ b/docs/advanced-usage-zh.md
@@ -281,11 +281,11 @@ iptables -t nat -A PREROUTING -i "$netif" ! -s 192.168.43.0/24 -p udp --dport 12
 
 ## VPN 分流
 
-在启用 VPN 分流 (split tunneling) 时，VPN 客户端将仅通过 VPN 隧道发送特定目标子网的流量。其他流量 **不会** 通过 VPN 隧道。VPN 分流有一些局限性，而且并非所有的 VPN 客户端都支持。
+在启用 VPN 分流 (split tunneling) 时，VPN 客户端将仅通过 VPN 隧道发送特定目标子网的流量。其他流量 **不会** 通过 VPN 隧道。这允许你通过 VPN 安全访问指定的网络，而无需通过 VPN 发送所有客户端的流量。VPN 分流有一些局限性，而且并非所有的 VPN 客户端都支持。
 
-高级用户可以为 [IPsec/XAuth ("Cisco IPsec")](clients-xauth-zh.md) 和/或 [IKEv2](ikev2-howto-zh.md) 模式启用 VPN 分流。这是可选的。IPsec/L2TP 模式不支持此功能（Windows 除外，见下文）。
+高级用户可以为 [IPsec/XAuth ("Cisco IPsec")](clients-xauth-zh.md) 和/或 [IKEv2](ikev2-howto-zh.md) 模式启用 VPN 分流。这是可选的。展开查看详情。IPsec/L2TP 模式不支持此功能（Windows 除外，见下文）。
 
-<details open>
+<details>
 <summary>
 IPsec/XAuth ("Cisco IPsec") 模式：启用 VPN 分流 (split tunneling)
 </summary>
@@ -302,7 +302,7 @@ IPsec/XAuth ("Cisco IPsec") 模式：启用 VPN 分流 (split tunneling)
    ```
 </details>
 
-<details open>
+<details>
 <summary>
 IKEv2 模式：启用 VPN 分流 (split tunneling)
 </summary>
@@ -332,7 +332,7 @@ IKEv2 模式：启用 VPN 分流 (split tunneling)
 1. 单击 **高级**，然后取消选中 **在远程网络上使用默认网关**。
 1. 单击 **确定** 以关闭 **属性** 对话框。
 1. **（重要）** 断开 VPN 连接，然后重新连接。
-1. 假设你想要 VPN 客户端通过 VPN 隧道发送流量的子网是 `10.123.123.0/24`。打开[提升权限命令提示符](http://www.cnblogs.com/xxcanghai/p/4610054.html)并运行以下命令。   
+1. 假设你想要 VPN 客户端通过 VPN 隧道发送流量的子网是 `10.123.123.0/24`。打开[提升权限命令提示符](http://www.cnblogs.com/xxcanghai/p/4610054.html)并运行以下命令之一。   
    对于 IKEv2 和 IPsec/XAuth ("Cisco IPsec") 模式：
    ```
    route add -p 10.123.123.0 mask 255.255.255.0 192.168.43.1
diff --git a/docs/advanced-usage.md b/docs/advanced-usage.md
index 83c94d4..1dbb8eb 100644
--- a/docs/advanced-usage.md
+++ b/docs/advanced-usage.md
@@ -281,11 +281,11 @@ If you want the rules to persist after reboot, you may add these commands to `/e
 
 ## Split tunneling
 
-With split tunneling, VPN clients will only send traffic for a specific destination subnet through the VPN tunnel. Other traffic will NOT go through the VPN tunnel. Split tunneling has some limitations, and is not supported by all VPN clients.
+With split tunneling, VPN clients will only send traffic for a specific destination subnet through the VPN tunnel. Other traffic will NOT go through the VPN tunnel. This allows you to gain secure access to a network through your VPN, without routing all your client's traffic through the VPN. Split tunneling has some limitations, and is not supported by all VPN clients.
 
-Advanced users can optionally enable split tunneling for the [IPsec/XAuth ("Cisco IPsec")](clients-xauth.md) and/or [IKEv2](ikev2-howto.md) modes. IPsec/L2TP mode does not support this feature (except on Windows, see below).
+Advanced users can optionally enable split tunneling for the [IPsec/XAuth ("Cisco IPsec")](clients-xauth.md) and/or [IKEv2](ikev2-howto.md) modes. Expand for details. IPsec/L2TP mode does not support this feature (except on Windows, see below).
 
-<details open>
+<details>
 <summary>
 IPsec/XAuth ("Cisco IPsec") mode: Enable split tunneling
 </summary>
@@ -302,7 +302,7 @@ The example below **ONLY** applies to IPsec/XAuth ("Cisco IPsec") mode. Commands
    ```
 </details>
 
-<details open>
+<details>
 <summary>
 IKEv2 mode: Enable split tunneling
 </summary>
@@ -332,7 +332,7 @@ Alternatively, Windows users can enable split tunneling by manually adding route
 1. Click **Advanced**. Uncheck **Use default gateway on remote network**.
 1. Click **OK** to close the **Properties** window.
 1. **(Important)** Disconnect the VPN, then re-connect.
-1. Assume that the subnet you want VPN clients to send traffic through the VPN tunnel is `10.123.123.0/24`. Open an [elevated command prompt](http://www.winhelponline.com/blog/open-elevated-command-prompt-windows/) and run the following commands:   
+1. Assume that the subnet you want VPN clients to send traffic through the VPN tunnel is `10.123.123.0/24`. Open an [elevated command prompt](http://www.winhelponline.com/blog/open-elevated-command-prompt-windows/) and run one of the following commands:   
    For IKEv2 and IPsec/XAuth ("Cisco IPsec") modes:
    ```
    route add -p 10.123.123.0 mask 255.255.255.0 192.168.43.1