diff --git a/public/src/client/register.js b/public/src/client/register.js
index 62dbc41..ab194f2 100644
--- a/public/src/client/register.js
+++ b/public/src/client/register.js
@@ -131,7 +131,8 @@ define('forum/register', [
                 if (results.every(obj => obj.status === 'rejected')) {
                     showSuccess(username_notify, successIcon);
                 } else {
-                    showError(username_notify, '[[error:username-taken]]');
+                    const suggestUser = username + '123';
+                    showError(username_notify, '[[error:username-taken]] Try "' + suggestUser + '" instead');
                 }
 
                 callback();