diff --git a/ptp4l.8 b/ptp4l.8
index 99b085c..46e6715 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -736,7 +736,7 @@ will negotiate unicast peer delay responses from the machine at the
 given remote address, otherwise the port will send multicast peer
 delay requests.
 .TP
-.B L2|UDPv4
+.B L2|UDPv4|UDPv6
 Each table entry specifies the transport type and network address of a
 potential remote master.  If multiple masters are specified, then
 unicast negotiation will be performed with each if them.