diff --git a/docs/source/reference/config-proxy.md b/docs/source/reference/config-proxy.md
index 28c01fd1..1e5c6bf7 100644
--- a/docs/source/reference/config-proxy.md
+++ b/docs/source/reference/config-proxy.md
@@ -208,6 +208,7 @@ Listen 443
     # proxy to JupyterHub
     ProxyPass         http://127.0.0.1:8000/
     ProxyPassReverse  http://127.0.0.1:8000/
+    RequestHeader     set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
   </Location>
 </VirtualHost>
 ```