diff --git a/docs/advanced-usage-zh.md b/docs/advanced-usage-zh.md
index 3bf47eda..d3db8a28 100644
--- a/docs/advanced-usage-zh.md
+++ b/docs/advanced-usage-zh.md
@@ -25,6 +25,8 @@ VPN_DNS_SRV1=1.1.1.1
 VPN_DNS_SRV2=1.0.0.1
 ```
 
+请注意，如果 Docker 容器中已经配置了 IKEv2，你还需要编辑 Docker 容器内的 `/etc/ipsec.d/ikev2.conf` 并将 `8.8.8.8` 和 `8.8.4.4` 替换为你的其他的 DNS 服务器，然后重新启动 Docker 容器。
+
 ## 不启用 privileged 模式运行
 
 高级用户可以在不启用 [privileged 模式](https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities) 的情况下使用本镜像创建一个 Docker 容器（将以下命令中的 `./vpn.env` 替换为你自己的 `env` 文件）。
diff --git a/docs/advanced-usage.md b/docs/advanced-usage.md
index 3d94ff56..b9c1b95e 100644
--- a/docs/advanced-usage.md
+++ b/docs/advanced-usage.md
@@ -25,6 +25,8 @@ VPN_DNS_SRV1=1.1.1.1
 VPN_DNS_SRV2=1.0.0.1
 ```
 
+Note that if IKEv2 is already set up in the Docker container, you will also need to edit `/etc/ipsec.d/ikev2.conf` inside the Docker container and replace `8.8.8.8` and `8.8.4.4` with your alternative DNS server(s), then restart the Docker container.
+
 ## Run without privileged mode
 
 Advanced users can create a Docker container from this image without using [privileged mode](https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities) (replace `./vpn.env` in the command below with your own `env` file).