diff --git a/db/migrate/20161015013348_change_description_for_attachment_history.rb b/db/migrate/20161015013348_change_description_for_attachment_history.rb
new file mode 100644
index 000000000..c3af1ec31
--- /dev/null
+++ b/db/migrate/20161015013348_change_description_for_attachment_history.rb
@@ -0,0 +1,9 @@
+class ChangeDescriptionForAttachmentHistory < ActiveRecord::Migration
+  def up
+    change_column :attachment_histories, :description, :text
+  end
+
+  def down
+    change_column :attachment_histories, :description, :string
+  end
+end