diff --git a/docs/source/reference/config-proxy.md b/docs/source/reference/config-proxy.md
index 564f2efc..9e493cf4 100644
--- a/docs/source/reference/config-proxy.md
+++ b/docs/source/reference/config-proxy.md
@@ -85,6 +85,8 @@ server {
         # websocket headers
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection $connection_upgrade;
+
+        proxy_buffering off;
     }
 
     # Managing requests to verify letsencrypt host