diff --git a/Directly-hosting-BlueMap-with-external-webservers.md b/Directly-hosting-BlueMap-with-external-webservers.md
index 2737c23..7382769 100644
--- a/Directly-hosting-BlueMap-with-external-webservers.md
+++ b/Directly-hosting-BlueMap-with-external-webservers.md
@@ -84,7 +84,10 @@ ProxyPreserveHost On
 ProxyPass /live/ http://127.0.0.1:8100/live/
 ProxyPassReverse /live/ http://127.0.0.1:8100/live/
 ```
-*(this needs the HEADERS, REWRITE and all PROXY mods for Apache to be enabled)*
+*(this needs the HEADERS, REWRITE and all PROXY (PROXY and PROXY_HTTP) modules for Apache to be enabled!)*
+*(you can check your anabled modules via `# apache2ctl -M` and check whether the modules are installed)*
+*(after installing any missing module via `# a2enmod MODULENAME` don't forget to restart apache2! )*
+
 
 ## Caddy
 Here is a solution from [@mbround18](https://github.com/mbround18) if you are using [Caddy](https://caddyserver.com/):