diff --git a/Gemfile b/Gemfile
index ef6d548..ccb429a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 gem 'sunspot_rails', '2.5.0'
+gem 'sunspot_cell', :git => "https://github.com/waterfield/sunspot_cell.git", :branch => "2.3.0"
 gem 'will_paginate', '~> 3.1.3'
 
 group :development do
diff --git a/lib/redmine_redsun/attachment_patch.rb b/lib/redmine_redsun/attachment_patch.rb
index 584eb9c..9deb97e 100644
--- a/lib/redmine_redsun/attachment_patch.rb
+++ b/lib/redmine_redsun/attachment_patch.rb
@@ -52,6 +52,8 @@ def self.included(base) # :nodoc:
           # Name of Project
           string :project_name, stored: true
 
+          # Content
+          attachment :diskfile
         end
       end
     end