diff --git a/Casks/mail-plugin-manager.rb b/Casks/mail-plugin-manager.rb
index 5c9eadc5c..911606fc8 100644
--- a/Casks/mail-plugin-manager.rb
+++ b/Casks/mail-plugin-manager.rb
@@ -4,7 +4,7 @@ cask :v1 => 'mail-plugin-manager' do
 
   url 'http://www.chungwasoft.com/files/MPM_latest.zip'
   homepage 'http://www.chungwasoft.com/mailpluginmanager/'
-  license :unknown    # todo: improve this machine-generated value
+  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
 
   app 'Mail Plugin Manager.app'
 end