Mentioned missing mkisofs -old-root functionality in man page

libisoburn/trunk/xorriso/xorriso.1

@@ -9,7 +9,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISO 1 "Jan 06, 2011"
+.TH XORRISO 1 "Jan 19, 2011"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -3521,6 +3521,9 @@ directory is added to the image. At the same occasion directory names get
 allowed to violate the standard by -compliance option allow_dir_id_ext.
 This may be avoided by option -disallow_dir_id_ext.
 .br
+Currently there is no emulation for -root and -old-root. Incremental backups
+can be done by native xorriso command -update_r. See also EXAMPLES section.
+.br
 Not original mkisofs options are --quoted_path_list ,
 --hardlinks , --acl ,
 --xattr , --md5 , --stdio_sync .
@@ -4293,6 +4296,8 @@ get endangered by the new write operation, while the newest backup is
 stored safely on a different media.
 Always have a blank media ready to perform a full backup in case the update
 attempt fails due to insufficient remaining capacity.
+.br
+This example produces a result similar to  -root / -old-root / with mkisofs.
 .SS
 .B Restore directory trees from a particular ISO session to disk
 This is an alternative to mounting the media and using normal file operations.
@@ -4410,7 +4415,7 @@ Thomas Schmitt <scdbackup@gmx.net>
 .br
 for libburnia-project.org
 .SH COPYRIGHT
-Copyright (c) 2007 - 2010 Thomas Schmitt
+Copyright (c) 2007 - 2011 Thomas Schmitt
 .br
 Permission is granted to distribute this text freely. It shall only be
 modified in sync with the technical properties of xorriso. If you make use