diff --git a/etc/unbound/unbound.conf.d/forwards.conf b/etc/unbound/unbound.conf.d/forwards.conf
index ecc7ddcd..86d141fb 100644
--- a/etc/unbound/unbound.conf.d/forwards.conf
+++ b/etc/unbound/unbound.conf.d/forwards.conf
@@ -1,6 +1,9 @@
 # Forward queries to
 forward-zone:
     name: "."
+    # Trex DNS64/NAT64 <http://www.trex.fi/2011/dns64.html>
+    #forward-addr: 2001:67c:2b0::4
+    #forward-addr: 2001:67c:2b0::6
     # Google
     forward-addr: 2001:4860:4860::8888
     forward-addr: 2001:4860:4860::8844