Note that dhcp_lease_time and dhcp_release only work for IPv4.
diff --git a/contrib/wrt/dhcp_lease_time.1 b/contrib/wrt/dhcp_lease_time.1
index 2720b71..2fa78d3 100644
--- a/contrib/wrt/dhcp_lease_time.1
+++ b/contrib/wrt/dhcp_lease_time.1
@@ -12,9 +12,11 @@
nothing is sent to stdout a message is sent to stderr and a
non-zero error code is returned.
-Requires dnsmasq 2.40 or later and may not work with other DHCP servers.
+Requires dnsmasq 2.67 or later and may not work with other DHCP servers.
-The address argument is a dotted-quad IP addresses and mandatory.
+The address argument is a dotted-quad IP addresses and mandatory.
+.SH LIMITATIONS
+Only works with IPv4 addresses and DHCP leases.
.SH SEE ALSO
.BR dnsmasq (8)
.SH AUTHOR