1 files changed, 14 insertions, 2 deletions
diff --git a/share/man/man4/udp.4 b/share/man/man4/udp.4
index 2f828bf..3d869c3 100644
--- a/share/man/man4/udp.4
+++ b/share/man/man4/udp.4
@@ -28,7 +28,7 @@
 .\"     @(#)udp.4	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd June 5, 1993
+.Dd February 6, 2017
 .Dt UDP 4
 .Os
 .Sh NAME
@@ -99,6 +99,17 @@ transport level may be used with
 .Tn UDP ;
 see
 .Xr ip 4 .
+.Tn UDP_ENCAP
+socket option may be used at the
+.Tn IPPROTO_UDP
+level to encapsulate
+.Tn ESP
+packets in
+.Tn UDP .
+Only one value is supported for this option:
+.Tn UDP_ENCAP_ESPINUDP
+from RFC 3948, defined in
+.In netinet/udp.h .
 .Sh MIB VARIABLES
 The
 .Nm
@@ -158,7 +169,8 @@ exists.
 .Xr blackhole 4 ,
 .Xr inet 4 ,
 .Xr intro 4 ,
-.Xr ip 4
+.Xr ip 4 ,
+.Xr udplite 4
 .Sh HISTORY
 The
 .Nm