diff --git a/app/models/archive_category.rb b/app/models/archive_category.rb
new file mode 100644
index 0000000..170468f
--- /dev/null
+++ b/app/models/archive_category.rb
@@ -0,0 +1,4 @@
+class ArchiveCategory
+  include Mongoid::Document
+  field :sort_number, type: Integer
+end
\ No newline at end of file