Checking MD5 of whole session with -check_md5 and empty path list

libisoburn/trunk/xorriso/xorriso.1

@@ -2532,6 +2532,10 @@ correction will fail and the drive is supposed to indicate error.
 xorriso can scan the media for readable data blocks, classify them according
 to their read speed, save them to a file, and keep track of successfuly saved
 blocks for further tries on the same media.
+.br
+By option -md5 checksums may get recorded with data files and whole
+sessions. These checksums are reachable only via indev and a loaded image.
+They work independently of the media type and can detect transmission errors.
 .TP
 \fB\-check_media\fR [option [option ...]] --
 Try to read data blocks from the indev drive, eventually copy them to a
@@ -2642,6 +2646,10 @@ of the program run. Severity ALL suppresses that event.
 This option reports match and mismatch of data files to the result channel.
 Non-data files cause NOTE events. There will also be UPDATE events from
 data reading.
+.br
+If no iso_rr_path is given then the whole loaded session is compared with its
+MD5 sum. Be aware that this covers only one session and not the whole image
+if there are older sessions.
 .TP
 \fB\-check_md5_r\fR severity iso_rr_path [***]
 Like -check_md5 but checking all data files underneath the given paths.