Index: dup.2
===================================================================
--- dup.2	(revision 224860)
+++ dup.2	(working copy)
@@ -28,7 +28,7 @@
 .\"     @(#)dup.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd June 4, 1993
+.Dd August 14, 2011
 .Dt DUP 2
 .Os
 .Sh NAME
@@ -115,6 +115,11 @@
 is a valid descriptor, then
 .Fn dup2
 is successful, and does nothing.
+.Pp
+The related
+.Xr cap_new 2
+system call allows file descriptors to be duplicated with restrictions on
+their use.
 .Sh RETURN VALUES
 The value -1 is returned if an error occurs in either call.
 The external variable
@@ -139,6 +144,7 @@
 .El
 .Sh SEE ALSO
 .Xr accept 2 ,
+.Xr cap_new 2 ,
 .Xr close 2 ,
 .Xr fcntl 2 ,
 .Xr getdtablesize 2 ,