===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/sed/sed.1,v
retrieving revision 1.44
retrieving revision 1.45
diff -u -r1.44 -r1.45
--- src/usr.bin/sed/sed.1	2014/10/22 23:23:22	1.44
+++ src/usr.bin/sed/sed.1	2015/07/17 20:38:57	1.45
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sed.1,v 1.44 2014/10/22 23:23:22 schwarze Exp $
+.\"	$OpenBSD: sed.1,v 1.45 2015/07/17 20:38:57 jasper Exp $
 .\"
 .\" Copyright (c) 1992, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -32,7 +32,7 @@
 .\"
 .\"	from: @(#)sed.1	8.2 (Berkeley) 12/30/93
 .\"
-.Dd $Mdocdate: October 22 2014 $
+.Dd $Mdocdate: July 17 2015 $
 .Dt SED 1
 .Os
 .Sh NAME
@@ -47,6 +47,7 @@
 .Op Fl aEnru
 .Op Fl e Ar command
 .Op Fl f Ar command_file
+.Op Fl i Ns Op Ar extension
 .Op Ar
 .Sh DESCRIPTION
 The
@@ -94,6 +95,16 @@
 .Ar command_file
 to the list of commands.
 The editing commands should each be listed on a separate line.
+.It Fl i Ar extension
+Edit files in-place, saving backups with the specified
+.Ar extension .
+If a zero-length
+.Ar extension
+is given, no backup will be saved.
+It is not recommended to give a zero-length
+.Ar extension
+when in-place editing files, as you risk corruption or partial content
+in situations where disk space is exhausted, etc.
 .It Fl r
 An alias for
 .Fl E ,
@@ -510,6 +521,12 @@
 squeezing excess empty lines from standard input:
 .Bd -literal -offset indent
 $ sed -n '
+.Pp
+The
+.Fl i
+option is a non-standard
+.Fx
+extension and may not be available on other operating systems.
 # Write non-empty lines.
 /./ {
     p
@@ -543,7 +560,7 @@
 specification.
 .Pp
 The flags
-.Op Fl aEru
+.Op Fl aEiru
 are extensions to that specification.
 .Pp
 The use of newlines to separate multiple commands on the command line