diff --git a/src/pretix/static/pretixpresale/js/ui/main.js b/src/pretix/static/pretixpresale/js/ui/main.js
index c38b1c8c2..85f615b5f 100644
--- a/src/pretix/static/pretixpresale/js/ui/main.js
+++ b/src/pretix/static/pretixpresale/js/ui/main.js
@@ -111,7 +111,7 @@ var form_handlers = function (el) {
         }).on('dp.change', function (e) {
             container.removeClass("has-error");
             alert.text("");
-        }).on('blur', function (e) {
+        }).on('blur', function (e) {// dp.change does not trigger when changed to empty string - although documentation notes otherwise
             if (!this.value) {
                 container.removeClass("has-error");
                 alert.text("");