diff --git a/_posts/2015-06-12-ufw.md b/_posts/2015-06-12-ufw.md
index 4226cc7..250072c 100644
--- a/_posts/2015-06-12-ufw.md
+++ b/_posts/2015-06-12-ufw.md
@@ -56,7 +56,8 @@ ufw allow 60000:61000/udp
   access to port only from specific addresses, only for devices that
   aren't going anywhere and if IPv6 isn't cared about. (TODO: How to do
   it IPv6? I have faint idea of UFW not supporting it).
-    * Transmission file transfer uses TCP. Default port: 51413.
+    * Transmission file transfer uses TCP and DHT UDP. Default port for
+      both is: 51413. [Source](https://trac.transmissionbt.com/ticket/2265)
 * 60000:61000 UDP/mosh — I feel this is the most insecure part of this
   setup and there should be something bettter instead of this. As
   something evil could run and listen on these ports.