diff --git a/djadmin2/admin2.py b/djadmin2/admin2.py
index dc49770..4b072eb 100644
--- a/djadmin2/admin2.py
+++ b/djadmin2/admin2.py
@@ -35,6 +35,7 @@ class UserAdmin2(djadmin2.ModelAdmin2):
     create_form_class = UserCreationForm
     update_form_class = UserChangeForm
     search_fields = ('username', 'groups__name')
+    # readonly_fields = ('username',)
 
     api_serializer_class = UserSerializer
 
diff --git a/djadmin2/renderers.py b/djadmin2/renderers.py
index 96fb417..a48c7e5 100644
--- a/djadmin2/renderers.py
+++ b/djadmin2/renderers.py
@@ -6,7 +6,6 @@ are used by default for some field types.
 from __future__ import division, absolute_import, unicode_literals
 
 import os.path
-from decimal import Decimal
 from datetime import date, time, datetime
 
 from django.db import models
diff --git a/djadmin2/settings.py b/djadmin2/settings.py
index 038272e..dbe66e9 100644
--- a/djadmin2/settings.py
+++ b/djadmin2/settings.py
@@ -14,6 +14,7 @@ MODEL_ADMIN_ATTRS = (
     'index_view', 'detail_view', 'create_view', 'update_view', 'delete_view',
     'get_default_view_kwargs', 'get_list_actions',
     'actions_on_bottom', 'actions_on_top',
-    'save_on_top', 'save_on_bottom')
+    'save_on_top', 'save_on_bottom',
+    'readonly_fields', )
 
 ADMIN2_THEME_DIRECTORY = getattr(settings, "ADMIN2_THEME_DIRECTORY", "djadmin2/bootstrap")