===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/cu/cu.1,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -r1.2 -r1.3
--- src/usr.bin/cu/cu.1	2012/07/10 08:16:27	1.2
+++ src/usr.bin/cu/cu.1	2012/07/10 09:10:04	1.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: cu.1,v 1.2 2012/07/10 08:16:27 nicm Exp $
+.\"	$OpenBSD: cu.1,v 1.3 2012/07/10 09:10:04 nicm Exp $
 .\"
 .\" Copyright (c) 1980, 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -113,6 +113,16 @@
 Stop
 .Nm
 (only available with job control).
+.It Ic ~C
+Fork a child process on the local system to perform special protocols
+such as XMODEM.
+The child program will be run with the following arrangement of
+file descriptors:
+.Bd -literal -offset indent
+0 \*(Lt-\*(Gt remote tty in
+1 \*(Lt-\*(Gt remote tty out
+2 \*(Lt-\*(Gt local tty stderr
+.Ed
 .It Ic ~S
 Change the speed of the connection.
 .It Ic ~?