diff --git a/UserDoc.md b/UserDoc.md
index 338ec56c..09548db2 100644
--- a/UserDoc.md
+++ b/UserDoc.md
@@ -47,4 +47,5 @@ Optional topics:
 -   [​How to run TorBrowser using external tor proxy (from TorVM)](https://groups.google.com/group/qubes-devel/msg/34f67194d3422bfa)
 -   [​Creating NetBSD VM](https://groups.google.com/group/qubes-devel/msg/4015c8900a813985)
 -   [​Booting with GRUB2 and GPT](https://groups.google.com/group/qubes-devel/browse_thread/thread/e4ac093cabd37d2b/d5090c20d92c4128#d5090c20d92c4128)
+-   [​HTTP filtering proxy in Qubes firewall VM](https://groups.google.com/group/qubes-devel/browse_thread/thread/5252bc3f6ed4b43e/d881deb5afaa2a6c#39c95d63fccca12b)