diff --git a/README.md b/README.md
index 3d6b9d6f5..cdf15cd2f 100644
--- a/README.md
+++ b/README.md
@@ -340,6 +340,10 @@ Please use Lagrange.Core responsibly and in accordance with the law.
 }
 ```
 
+> [!WARNING]
+> 
+> On Linux, `Host` for `ForwardWebSocket` and `Http` must use the same value as `Host` in the request header, except for `*` and `+`! This is an upstream bug.
+
 ## NOTICE BEFORE LOGIN
 
 - The NewDeviceLogin feature has not been implemented yet. It is recommended to use QRCode login for now.
diff --git a/README_zh.md b/README_zh.md
index 761287a9b..926dd14ee 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -344,6 +344,10 @@ Please use Lagrange.Core responsibly and in accordance with the law.
 }
 ```
 
+> [!WARNING]
+> 
+> 在 Linux 上，用于 `ForwardWebSocket` 和 `Http` 的 `Host` 必须使用与请求头中的 `Host` 相同的值，但 `*` 和 `+` 除外！这是一个上游错误。
+
 ## 登录前须知
 
 - 目前新设备登录尚未实现，建议使用二维码登录