Documented new timestamp behavior of El Torito catalog file

xorriso/xorrisofs.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 XORRISOFS 1 "Version 1.4.5, Aug 06, 2016"
+.TH XORRISOFS 1 "Version 1.4.5, Aug 07, 2016"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -570,6 +570,9 @@ revoked by \-\-set_all_file_dates with empty timestring.
 In any case files which get into the ISO after mkisofs emulation ended
 will not be affected, unless another mkisofs emulation
 applies \-\-set_all_file_date again.
+.br
+The timestamps of the El Torito boot catalog file get refreshed when the ISO
+is produced. They can be influenced by \-\-modification\-date=.
 .TP
 \fB\-file_name_limit\fR number
 Set the maximum permissible length for file names in the range of 64 to 255.
@@ -891,6 +894,9 @@ It is supposed to match this GRUB line:
  search \-\-fs\-uuid \-\-set YYYY\-MM\-DD\-hh\-mm\-ss\-cc
 .br
 E.g. 2010040711405800 is 7 Apr 2010 11:40:58 (+0 centiseconds).
+.br
+Among the influenced timestamps are:
+isohybrid MBR id, El Torito boot catalog file, HFS+ superblock.
 .TP
 \fB--application_use\fR character|0xXY|disk_path
 Specify the content of the Application Use field which can take at most