diff --git a/app/models/bulletin.rb b/app/models/bulletin.rb
index 516acd2..6d56988 100644
--- a/app/models/bulletin.rb
+++ b/app/models/bulletin.rb
@@ -16,6 +16,7 @@ class Bulletin
   field :public, :type => Boolean, :default => true
   field :postdate , :type => DateTime, :default => Time.now
   field :deadline , :type => DateTime
+  field :rss2_sn
 
   field :email_id
   field :email_sent, :type => Boolean, :default => false