diff --git a/etc/chrony/chrony.conf b/etc/chrony/chrony.conf
index 6931779e..fd8de384 100644
--- a/etc/chrony/chrony.conf
+++ b/etc/chrony/chrony.conf
@@ -9,6 +9,9 @@
 
 # Local NTP servers, see allow lines in the bottom
 #server LOCALMACHINE.local iburst auto_offline prefer
+# Or alternatively reciprocaully TODO: how do `key` options work? This
+#  apparently should only be done in trusted LAN.
+#peer LOCALMACHINE.local auto_offline prefer
 
 # Public official Finnish time server, I am very surprised if there is leap
 # smearing