diff --git a/src/apptask.js b/src/apptask.js
index c3eea559c..affc72c90 100644
--- a/src/apptask.js
+++ b/src/apptask.js
@@ -349,6 +349,8 @@ function registerSubdomains(app, overwrite, callback) {
 
         const allDomains = [ { subdomain: app.location, domain: app.domain }].concat(app.alternateDomains);
 
+        debug(`registerSubdomain: Will register ${JSON.stringify(allDomains)}`);
+
         async.eachSeries(allDomains, function (domain, iteratorDone) {
             async.retry({ times: 200, interval: 5000 }, function (retryCallback) {
                 debugApp(app, 'Registering subdomain: %s%s', domain.subdomain ? (domain.subdomain + '.') : '', domain.domain);