-This is the subnet range of all IP addresses that will be accepted by
-the host that defines it.
-
-The range must be contained in the IP address range of the tap device,
-not the real IP address of the host running tincd.
+@item Subnet = <address[/masklength]>
+The subnet which this tinc daemon will serve.
+tinc tries to look up which other daemon it should send a packet to by searching the appropiate subnet.
+If the packet matches a subnet,
+it will be sent to the daemon who has this subnet in his host configuration file.
+Multiple subnet lines can be specified for each daemon.
+
+Subnets can either be single MAC, IPv4 or IPv6 addresses,
+in which case a subnet consisting of only that single address is assumed,
+or they can be a IPv4 or IPv6 network address with a masklength.
+For example, IPv4 subnets must be in a form like 192.168.1.0/24,
+where 192.168.1.0 is the network address and 24 is the number of bits set in the netmask.
+Note that subnets like 192.168.1.1/24 are invalid!
+Read a networking HOWTO/FAQ/guide if you don't understand this.
+IPv6 subnets are notated like fec0:0:0:1:0:0:0:0/64.
+MAC addresses are notated like 0:1a:2b:3c:4d:5e.