diff --git a/app/models/admin_user.rb b/app/models/admin_user.rb
index 039464f..3054b69 100644
--- a/app/models/admin_user.rb
+++ b/app/models/admin_user.rb
@@ -5,5 +5,8 @@ class AdminUser < ActiveRecord::Base
          :recoverable, :rememberable, :trackable, :validatable
 
   # Setup accessible (or protected) attributes for your model
-  attr_accessible :email, :password, :password_confirmation, :remember_me
+  # obsoleted in Rails 4.
+  # see http://blog.remarkablelabs.com/2012/12/strong-parameters-rails-4-countdown-to-2013
+  # TODO delete this (commented out) block.
+  # attr_accessible :email, :password, :password_confirmation, :remember_me
 end