\fB-l <db filename list>\fR, \fB--db-list <db filename list>\fR
set the semicolon-separated list of db files for search
.TP
-\fB-s <search pattern>\fR, \fB--search <search pattern>\fR
-search for matching mails in the db file
+\fB-s <search pattern>\fR, \fB--search <search pattern>\fR search for
+matching mails in the db file. Multiple search requests can be
+combined, and only mails fulfilling all of them will be extracted.
.TP
\fB-d <db filename>\fR, \fB--db-file <db filename>\fR
set the db filename for indexing
index mails in the mailboxes located recursively anywhere in the
directories following the options on the command lines
.TP
-\fB-o <output filename>\fR, \fB--output <output filename>\fR
-set the db filename pattern for recursive search
+\fB-o <output filename>\fR, \fB--output <output filename>\fR set the
+result mbox filename. If it is not set, the standard output is used
.TP
\fB-a <search field>\fR, \fB--default-search <search field>\fR
set the default search field: If a search request is not understood,