diff --git a/lib/http/cookie.rb b/lib/http/cookie.rb
index a13b8e1..6a35829 100644
--- a/lib/http/cookie.rb
+++ b/lib/http/cookie.rb
@@ -41,6 +41,7 @@ class HTTP::Cookie
   attr_reader :name
   attr_accessor :value, :version
   attr_accessor :domain, :path, :secure
+  attr_reader :domain_name
   attr_accessor :comment, :max_age
 
   attr_accessor :session