$NetBSD$

--- nttcp.1.orig	2000-08-16 20:20:45.000000000 +1000
+++ nttcp.1
@@ -109,6 +109,9 @@ given fixed length.
 Defines the buffer size of the transmitting and receiving socket.
 This is system dependant; usally it is 16K.
 .TP
+.BI "\-U " "number of seconds"
+Run until approximately the given number of seconds have passed.
+.TP
 .B "\-c "
 If this option is present, the receiving side will compare the
 bytes received with the pattern used by the sending side. At
