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+.TH NOTMUCH-DUMP 1 2011-12-04 "Notmuch 0.10.2"
+.SH NAME
+notmuch-dump \- Creates a plain-text dump of the tags of each message.
+
+.SH SYNOPSIS
+
+.B "notmuch dump"
+.RI "[ <" filename "> ] [--]"
+.RI "[ <" search-term ">...]"
+
+.B "notmuch restore"
+.RB [ "--accumulate" ]
+.RI "[ <" filename "> ]"
+
+.SH DESCRIPTION
+
+.TP
+.BR dump " [<filename>]"
+
+Dump tags for messages matching the given search terms.
+
+Output is to the given filename, if any, or to stdout.  Note that
+using the filename argument is deprecated.
+
+These tags are the only data in the notmuch database that can't be
+recreated from the messages themselves.  The output of notmuch dump is
+therefore the only critical thing to backup (and much more friendly to
+incremental backup than the native database files.)
+
+With no search terms, a dump of all messages in the database will be
+generated.  A "--" argument instructs notmuch that the
+remaining arguments are search terms.
+
+.TP
+.BR restore " [--accumulate] [<filename>]"
+
+Restores the tags from the given file (see
+.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.
+So if you've previously been using sup for mail, then the
+.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
+
+See the
+.B "SEARCH SYNTAX"
+section below for details of the supported syntax for <search-terms>.
+.RE