diff --git a/public/src/client/register.js b/public/src/client/register.js
index d8144d26d5..a019858562 100644
--- a/public/src/client/register.js
+++ b/public/src/client/register.js
@@ -135,7 +135,8 @@ define('forum/register', [
 				if (results.every(obj => obj.status === 'rejected')) {
 					showSuccess(usernameInput, username_notify, successIcon);
 				} else {
-					showError(usernameInput, username_notify, '[[error:username-taken]]');
+					const errorMessage = `[[error:username-taken]]. Maybe try ${('#username').val()}suffix`;
+					showError(usernameInput, username_notify, errorMessage);
 				}
 
 				callback();