diff --git a/public/language/ar/error.json b/public/language/ar/error.json
index 9d0edec4bd..89a43f9ee9 100644
--- a/public/language/ar/error.json
+++ b/public/language/ar/error.json
@@ -32,7 +32,7 @@
     "invalid-path": "Invalid path",
     "folder-exists": "Folder exists",
     "invalid-pagination-value": "رقم الصفحة غير صحيح ، يجب أن يكون بين %1 و %2 .",
-    "username-taken": "اسم المستخدم مأخوذ",
+    "username-taken": "Username take, consider test123prefix",
     "email-taken": "Email address is already taken.",
     "email-nochange": "The email entered is the same as the email already on file.",
     "email-invited": "Email was already invited",
diff --git a/public/src/client/register.js b/public/src/client/register.js
index f989901e7b..5fb6074c23 100644
--- a/public/src/client/register.js
+++ b/public/src/client/register.js
@@ -135,7 +135,7 @@ define('forum/register', [
 				if (results.every(obj => obj.status === 'rejected')) {
 					showSuccess(usernameInput, username_notify, successIcon);
 				} else {
-					showError(usernameInput, username_notify, '[[error:username-taken]]');
+					showError(usernameInput, username_notify, `[[error:username-taken]], ${username}`);
 				}
 
 				callback();