The
.BR dump " and " restore
commands can be used to create a textual dump of email tags for backup
-purposes, and to restore from that dump
+purposes, and to restore from that dump.
.RS 4
.TP 4
.RE
.TP
-.BR restore " <filename>"
+.BR restore " [--accumulate] [<filename>]"
Restores the tags from the given file (see
-.BR "notmuch dump" "."
+.BR "notmuch dump" ")."
+
+The input is read from the given filename, if any, or from stdin.
Note: The dump file format is specifically chosen to be
compatible with the format of files produced by sup-dump.
.B "notmuch restore"
command provides you a way to import all of your tags (or labels as
sup calls them).
+
+The --accumulate switch causes the union of the existing and new tags to be
+applied, instead of replacing each message's tags as they are read in from the
+dump file.
.RE
The