diff --git a/acme.sh b/acme.sh
index e5dabb3a..54e33730 100755
--- a/acme.sh
+++ b/acme.sh
@@ -3592,6 +3592,11 @@ _initconf() {
 #
 #GD_Secret=\"sADDsdasdfsdfdssdgdsf\"
 
+#######################
+#nsupdate:
+#NSUPDATE_KEY=\"/path/to/update.key\"
+#NSUPDATE_SERVER=\"192.168.0.1\"
+
 #######################
 #PowerDNS:
 #PDNS_Url=\"http://ns.example.com:8081\"
diff --git a/dnsapi/dns_nsupdate.sh b/dnsapi/dns_nsupdate.sh
new file mode 100755
index 00000000..a024e314
--- /dev/null
+++ b/dnsapi/dns_nsupdate.sh
@@ -0,0 +1,60 @@
+#!/usr/bin/env sh
+
+
+########  Public functions #####################
+
+#Usage: dns_nsupdate_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_nsupdate_add() {
+  fulldomain=$1
+  txtvalue=$2
+  _checkKeyFile || return 1
+  [ -n "${NSUPDATE_SERVER}" ] || NSUPDATE_SERVER="localhost"
+  # save the dns server and key to the account conf file.
+  _saveaccountconf NSUPDATE_SERVER "${NSUPDATE_SERVER}"
+  _saveaccountconf NSUPDATE_KEY "${NSUPDATE_KEY}"
+  _info "adding ${fulldomain}. 60 in txt \"${txtvalue}\""
+  nsupdate -k "${NSUPDATE_KEY}" <<EOF
+server ${NSUPDATE_SERVER}
+update add ${fulldomain}. 60 in txt "${txtvalue}"
+send
+EOF
+  if [ $? -ne 0 ]; then
+    _err "error updating domain"
+    return 1
+  fi
+  
+  return 0
+}
+
+#Usage: dns_nsupdate_rm   _acme-challenge.www.domain.com
+dns_nsupdate_rm() {
+  fulldomain=$1
+  _checkKeyFile || return 1
+  [ -n "${NSUPDATE_SERVER}" ] || NSUPDATE_SERVER="localhost"
+  _info "removing ${fulldomain}. txt"
+  nsupdate -k "${NSUPDATE_KEY}" <<EOF
+server ${NSUPDATE_SERVER}
+update delete ${fulldomain}. txt
+send
+EOF
+  if [ $? -ne 0 ]; then
+    _err "error updating domain"
+    return 1
+  fi
+
+  return 0
+}
+
+
+####################  Private functions bellow ##################################
+
+_checkKeyFile() {
+  if [ -z "${NSUPDATE_KEY}" ]; then
+    _err "you must specify a path to the nsupdate key file"
+    return 1
+  fi
+  if [ ! -r "${NSUPDATE_KEY}" ]; then
+    _err "key ${NSUPDATE_KEY} is unreadable"
+    return 1
+  fi
+}