diff --git a/VLESS-GRPC/README.md b/VLESS-GRPC/README.md
index 12e4b73..6d232f4 100644
--- a/VLESS-GRPC/README.md
+++ b/VLESS-GRPC/README.md
@@ -5,7 +5,7 @@ Xray client <--- gRPC(TLS) ---> Caddy2 <--- gRPC(cleartext) ---> Xray server
 同时，您也可以选择使用 Nginx。示例配置片段如下（部分来自 [@xqzr](https://github.com/xqzr)）：
 ```conf
 server {
-	listen 443 ssl http2;
+	listen 443 ssl http2 so_keepalive=on;
 	server_name example.com;
 
 	index index.html;