diff --git a/rootfs/usr/local/etc/docker/init.d/02-named.sh b/rootfs/usr/local/etc/docker/init.d/02-named.sh
index b24bf85..033218a 100755
--- a/rootfs/usr/local/etc/docker/init.d/02-named.sh
+++ b/rootfs/usr/local/etc/docker/init.d/02-named.sh
@@ -337,8 +337,10 @@ zone "$domain_name" {
     type master;
     notify yes;
     also-notify { $DNS_SERVER_SECONDARY; };
+    update-policy {	grant ddns-key zonesub ANY; };
     allow-transfer { any; key "backup-key"; trusted; };
-    allow-update {key "certbot."; key "dhcp-key"; trusted; };
+    allow-update {key "certbot."; key "dhcp-key"; trusted; key "ddns-key" };
+
     file "$VAR_DIR/primary/$file_name";
 };
 #  ********** end $domain_name **********