diff --git a/Casks/things.rb b/Casks/things.rb
index 47b1c30bf..ae415c68c 100644
--- a/Casks/things.rb
+++ b/Casks/things.rb
@@ -5,6 +5,7 @@ class Things < Cask
   url 'https://culturedcode.com/things/download/'
   appcast 'http://downloads.culturedcode.com/things/download/Things_Updates.php'
   homepage 'http://culturedcode.com/things/'
+  license :unknown
 
   app 'Things.app'
 end