diff --git a/Casks/doubletwist.rb b/Casks/doubletwist.rb
index 81fc50215e3..82e919f6b92 100644
--- a/Casks/doubletwist.rb
+++ b/Casks/doubletwist.rb
@@ -1,5 +1,6 @@
 class Doubletwist < Cask
   url 'http://download.doubletwist.com/releases/mac/dT-3.1.2-kronos-patch1-r11040/doubleTwist.dmg'
+  appcast 'http://download.doubletwist.com/mac/appcast.xml'
   homepage 'http://www.doubletwist.com/'
   version '3.1.2'
   sha256 '47975cc7517a6cf8c90362536a7feb53f0ff8af7d45866481d37cad2fcae4dac'