diff --git a/Casks/mou.rb b/Casks/mou.rb
index 84bfdc4ab50..0d259400410 100644
--- a/Casks/mou.rb
+++ b/Casks/mou.rb
@@ -6,7 +6,7 @@ cask :v1 => 'mou' do
   appcast 'http://25.io/mou/up/updates.xml'
   name 'Mou'
   homepage 'http://25.io/mou/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :commercial
 
   app 'Mou.app'