diff --git a/app/models/research.rb b/app/models/research.rb
index 1fcb1da..75f6331 100644
--- a/app/models/research.rb
+++ b/app/models/research.rb
@@ -16,6 +16,7 @@ class Research
   field :keywords
   field :url
   field :note
+  field :rss2_id
   field :create_user_id, :type => BSON::ObjectId
   field :update_user_id, :type => BSON::ObjectId