diff --git a/README.md b/README.md
index 3326e99..3170985 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,9 @@ Requirements
  - an authoritive DNS server responsible for the records to be dynamically
    updated which is capable of RFC2136 (e.g. knot, bind)
  - `knsupdate` needs to be installed for sending DNS update requests
+ - a reverse-proxy for https (e.g. nginx), this is optional and `dyndns-server`
+   can also directly operate at port 80 which is discouraged as otherwise
+   secrets will be transmitted unencrypted
 
 Configuration
 -------------