diff --git a/Casks/fivedetails-flow.rb b/Casks/fivedetails-flow.rb
index a5b24522955..31de7a39327 100644
--- a/Casks/fivedetails-flow.rb
+++ b/Casks/fivedetails-flow.rb
@@ -3,6 +3,7 @@ cask 'fivedetails-flow' do
   sha256 '8337d4f2152d7b00bb18cde16475c47a3a2608a7d773ee7ce0dcc425ccfbc5b8'
 
   url 'http://fivedetails.com/flow/download'
+  # extendmac.com verified as official when first introduced to the cask
   appcast 'http://extendmac.com/flow/updates/update.php',
           checkpoint: '1278a4390fd8345f94365aa5dde30ce195f4e879ade82e011ab9a4b6b56f27c6'
   name 'Flow'