diff --git a/devtools_options.yaml b/devtools_options.yaml
new file mode 100644
index 0000000..7e7e7f6
--- /dev/null
+++ b/devtools_options.yaml
@@ -0,0 +1 @@
+extensions:
diff --git a/lib/views/authentication/screens/username.dart b/lib/views/authentication/screens/username.dart
index 7d2b73a..4c33fc6 100644
--- a/lib/views/authentication/screens/username.dart
+++ b/lib/views/authentication/screens/username.dart
@@ -1,6 +1,7 @@
 import 'package:didvan/views/authentication/authentication_state.dart';
 import 'package:didvan/views/authentication/widgets/authentication_layout.dart';
 import 'package:didvan/views/widgets/didvan/button.dart';
+import 'package:didvan/views/widgets/didvan/text.dart';
 import 'package:didvan/views/widgets/didvan/text_field.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
@@ -46,8 +47,12 @@ class _UsernameInputState extends State<UsernameInput> {
             },
           ),
         ),
-        const SizedBox(
-          height: 20,
+        Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: DidvanText(
+            'نام کاربری می‌تواند شامل کاراکترهای کوچک و بزرگ انگلیسی و اعداد باشد.',
+            style: Theme.of(context).textTheme.labelSmall,
+          ),
         ),
         DidvanButton(
           title: 'ورود',
diff --git a/lib/views/profile/edit_profile/edit_profile.dart b/lib/views/profile/edit_profile/edit_profile.dart
index 51d2de5..fd279bd 100644
--- a/lib/views/profile/edit_profile/edit_profile.dart
+++ b/lib/views/profile/edit_profile/edit_profile.dart
@@ -87,6 +87,13 @@ class _EditProfileState extends State<EditProfile> {
                           onChanged: _onUsernameChanged,
                           initialValue: state.user.username,
                         ),
+                        Padding(
+                          padding: const EdgeInsets.all(8.0),
+                          child: DidvanText(
+                            'نام کاربری می‌تواند شامل کاراکترهای کوچک و بزرگ انگلیسی و اعداد باشد.',
+                            style: Theme.of(context).textTheme.labelSmall,
+                          ),
+                        ),
                         AnimatedVisibility(
                           duration: DesignConfig.lowAnimationDuration,
                           isVisible: !_usernameIsAvailible,