diff --git a/webserver/templates/sites/open-xchange.conf b/webserver/templates/sites/open-xchange.conf
index 2afb005903a05a8d6efc3c40f2078a8764c39ee9..40c2a027193227fd804f6ad598c83d41471a3f0a 100644
--- a/webserver/templates/sites/open-xchange.conf
+++ b/webserver/templates/sites/open-xchange.conf
@@ -1,3 +1,5 @@
+# taken from https://gist.github.com/stbuehler/70ec37592957ab900469b75a05baa152 by Stefan Bühler
+
 upstream oxcluster {
     server 127.0.0.1:8009 weight=50;
 }