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diff --git a/doc/tinc.conf.5.in b/doc/tinc.conf.5.in
index 9d9bf76f..48c3df50 100644
--- a/doc/tinc.conf.5.in
+++ b/doc/tinc.conf.5.in
@@ -485,6 +485,18 @@ and will only allow connections with nodes for which host config files are prese
 .Pa @sysconfdir@/tinc/ Ns Ar NETNAME Ns Pa /hosts/
 directory.
 Setting this options also implicitly sets StrictSubnets.
+.It Va UDPDiscovery Li = yes | no Po yes Pc
+When this option is enabled tinc will try to establish UDP connectivity to nodes,
+using TCP while it determines if a node is reachable over UDP. If it is disabled,
+tinc always assumes a node is reachable over UDP.
+Note that tinc will never use UDP with nodes that have
+.Va TCPOnly
+enabled.
+.It Va UDPDiscoveryInterval Li = Ar seconds Pq 9
+The minimum amount of time between sending UDP ping datagrams to test UDP connectivity.
+.It Va UDPDiscoveryTimeout Li = Ar seconds Pq 30
+If tinc doesn't receive any UDP ping replies over the specified interval,
+it will assume UDP communication is broken and will fall back to TCP.
 .It Va UDPRcvBuf Li = Ar bytes Pq OS default
 Sets the socket receive buffer size for the UDP socket, in bytes.
 If unset, the default buffer size will be used by the operating system.