diff --git a/Setup-Reverse-Proxy.md b/Setup-Reverse-Proxy.md
index 0b70876..b222a2a 100644
--- a/Setup-Reverse-Proxy.md
+++ b/Setup-Reverse-Proxy.md
@@ -29,7 +29,8 @@ http {
     }
 }
 ```
-If you want to use nginx as proxy for subdomain just replace the `/calibre` lines with `/`, do not change anything else and it will work
+If you want to use nginx as proxy for subdomain just replace the `/calibre` lines with `/`, do not change anything else and it will work.
+The `X-Scheme` directive is used to preserve the protocol (http/https), it could be hard coded to `http` or `https` to force this type of protocol.\
 *Note: If using SSL in your reverse proxy on a non-standard port (e.g.12345), the following proxy_redirect line may be required:*
 ```
 proxy_redirect http://$host/ https://$host:12345/;