diff --git a/README.md b/README.md
index bd8760d..7d2b3c9 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,7 @@ mail.example.com smtp.example.com webmail.example.net *.intra.example.com:
   nsupdate_server: ns1.example.com
   nsupdate_keyname: mail
   nsupdate_keyvalue: Test1234512359==
+  nsupdate_keyalgorithm: HMAC-MD5.SIG-ALG.REG.INT
 - domain: webmail.example.net
   mode: dns.nsupdate
   nsupdate_server: ns1.example.net