diff --git a/etc/unbound/unbound.conf.d/blocklist.conf b/etc/unbound/unbound.conf.d/blocklist.conf
index 3510c1cd..a8b2aa3c 100644
--- a/etc/unbound/unbound.conf.d/blocklist.conf
+++ b/etc/unbound/unbound.conf.d/blocklist.conf
@@ -1,4 +1,4 @@
-# This domain NXDOMAINS the domains listed.
+# This domain NXDOMAINS the domains listed. via https://www.reddit.com/r/PFSENSE/comments/9mipe0/unboundbased_dnsblacklisting/
 
 # Riot.im communicates with the domains below a bit too happily. These are
 # a bit controversial, so I am keeping them commented in git.