diff --git a/Casks/twelf.rb b/Casks/twelf.rb
index 30d6d3bff..54f6a52cc 100644
--- a/Casks/twelf.rb
+++ b/Casks/twelf.rb
@@ -2,6 +2,7 @@ cask :v1 => 'twelf' do
   version '1.7.1'
   sha256 'be9e638d0c1dca17d70b06218084b6012fe74aecae09183db457c1c25f7cf3a0'
 
+  # plparty.org is the official download host per the vendor homepage
   url "http://twelf.plparty.org/releases/twelf-osx-#{version}.dmg"
   homepage 'http://www.twelf.org'
   license :bsd