diff --git a/lib/ddns/dns-ctrl.js b/lib/ddns/dns-ctrl.js
index 2c8912b..59eee35 100644
--- a/lib/ddns/dns-ctrl.js
+++ b/lib/ddns/dns-ctrl.js
@@ -108,7 +108,7 @@ module.exports.create = function (deps, conf) {
       return record.value === addr && badAddrDomains.indexOf(record.host) < 0;
     }).map(record => record.host);
     var requiredUpdates = domains.filter(function (domain) {
-      return goodAddrDomains.indexOf(domain) !== -1;
+      return goodAddrDomains.indexOf(domain) < 0;
     });
 
     var oldDns = await splitDomains(directives.api, badAddrDomains);
@@ -120,6 +120,9 @@ module.exports.create = function (deps, conf) {
     await deps.PromiseA.all(oldDns.map(function (record) {
       return deps.OAUTH3.api(directives.api, Object.assign({}, common, record));
     }));
+    if (conf.debug && badAddrDomains.length) {
+      console.log('removed bad DNS records for ' + badAddrDomains.join(', '));
+    }
 
     var newDns = await splitDomains(directives.api, requiredUpdates);
     common = {
@@ -132,6 +135,9 @@ module.exports.create = function (deps, conf) {
     await deps.PromiseA.all(newDns.map(function (record) {
       return deps.OAUTH3.api(directives.api, Object.assign({}, common, record));
     }));
+    if (conf.debug && requiredUpdates.length) {
+      console.log('set new DNS records for ' + requiredUpdates.join(', '));
+    }
   }
 
   async function getDeviceAddresses(session) {