diff --git a/HISTORY.md b/HISTORY.md
index cbfc547d..5c999be0 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,6 @@
 *2020.05.13*
 
-The Tor Project deleted important ticket, [number 24351](https://trac.torproject.org/projects/tor/ticket/24351) after the spammer replaced it with child porn images which hosted on the Tor Onion service. [Ticket 34175](https://trac.torproject.org/projects/tor/ticket/34175).
+The Tor Project [deleted](https://lists.torproject.org/pipermail/anti-censorship-team/2020-May/000098.html) important ticket, [number 24351](https://trac.torproject.org/projects/tor/ticket/24351) after the spammer replaced it with child porn images which hosted on the Tor Onion service. [Ticket 34175](https://trac.torproject.org/projects/tor/ticket/34175).
 
 *2020.02.25*