diff --git a/S3-Nginx-Proxy.md b/S3-Nginx-Proxy.md
index 24c44e6..088af2a 100644
--- a/S3-Nginx-Proxy.md
+++ b/S3-Nginx-Proxy.md
@@ -10,7 +10,11 @@ Additionally, make sure that `proxy_request_buffering` is `off` (default is `on`
 ### Example Nginx config
 
 ```
-upstream seaweedfs { server localhost:8333 fail_timeout=0; keepalive 20;}
+upstream seaweedfs { 
+	hash $arg_uploadId consistent;
+	server localhost:8333 fail_timeout=0; 
+	keepalive 20;
+}
 
 ## Also you can use unix domain socket instead for better performance:
 # upstream seaweedfs { server unix:/tmp/seaweedfs-s3-8333.sock; keepalive 20;}