diff --git a/README-zh.md b/README-zh.md
index 1720793..db1b37b 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -205,7 +205,7 @@ sudo sh vpn.sh
 
 在 VPN 已连接时，客户端配置为使用 [Google Public DNS](https://developers.google.com/speed/public-dns/)。如果偏好其它的域名解析服务，请参见 [高级用法](docs/advanced-usage-zh.md)。
 
-使用内核支持有助于提高 IPsec/L2TP 性能。它在所有 [受支持的系统](#系统要求) 上可用。Ubuntu 系统需要安装 `linux-modules-extra-$(uname -r)`（或者 `linux-image-extra`）软件包并运行 `service xl2tpd restart`。
+使用内核支持有助于提高 IPsec/L2TP 性能。它在所有 [受支持的系统](#系统要求) 上可用。Ubuntu 系统需要安装 `linux-modules-extra-$(uname -r)` 软件包并运行 `service xl2tpd restart`。
 
 这些脚本在更改现有的配置文件之前会先做备份，使用 `.old-日期-时间` 为文件名后缀。
 
diff --git a/README.md b/README.md
index 8d17f8e..b047549 100644
--- a/README.md
+++ b/README.md
@@ -205,7 +205,7 @@ For servers with an external firewall (e.g. [EC2](https://docs.aws.amazon.com/AW
 
 Clients are set to use [Google Public DNS](https://developers.google.com/speed/public-dns/) when the VPN is active. If another DNS provider is preferred, see [Advanced usage](docs/advanced-usage.md).
 
-Using kernel support could improve IPsec/L2TP performance. It is available on [all supported OS](#requirements). Ubuntu users should install the `linux-modules-extra-$(uname -r)` (or `linux-image-extra`) package and run `service xl2tpd restart`.
+Using kernel support could improve IPsec/L2TP performance. It is available on [all supported OS](#requirements). Ubuntu users should install the `linux-modules-extra-$(uname -r)` package and run `service xl2tpd restart`.
 
 The scripts will backup existing config files before making changes, with `.old-date-time` suffix.