diff --git a/db/migrate/20111104075030_change_signature_type.rb b/db/migrate/20111104075030_change_signature_type.rb
new file mode 100644
index 0000000..5946817
--- /dev/null
+++ b/db/migrate/20111104075030_change_signature_type.rb
@@ -0,0 +1,9 @@
+class ChangeSignatureType < ActiveRecord::Migration
+  def self.up
+    change_column :contracts, :signature, :text
+  end
+
+  def self.down
+    change_column :contracts, :signature, :binary
+  end
+end