diff --git a/Casks/mailplane.rb b/Casks/mailplane.rb
index 8b2af89d766..55a42ffb787 100644
--- a/Casks/mailplane.rb
+++ b/Casks/mailplane.rb
@@ -4,7 +4,7 @@ cask :v1 => 'mailplane' do
 
   url 'http://update.mailplaneapp.com/mailplane_3.php'
   homepage 'http://mailplaneapp.com'
-  license :unknown
+  license :unknown    # todo: improve this machine-generated value
 
   app 'Mailplane 3.app'