diff --git a/Casks/key-codes.rb b/Casks/key-codes.rb
index 0d25b37ba..8de799608 100644
--- a/Casks/key-codes.rb
+++ b/Casks/key-codes.rb
@@ -5,6 +5,7 @@ class KeyCodes < Cask
   url 'http://manytricks.com/download/keycodes'
   appcast 'http://manytricks.com/keycodes/appcast.xml'
   homepage 'http://manytricks.com/keycodes/'
+  license :unknown
 
   app 'Key Codes.app'
 end