=head1 DESCRIPTION
Import messages into the local storage of L<lei(1)>. C<LOCATION> is a
-source of messages: a directory (Maildir) or a file (whose format is
-specified via C<--format>).
+source of messages: a directory (Maildir) or a file. For a regular
+file, the location must have a C<E<lt>formatE<gt>:> prefix specifying
+one of the following formats: C<eml>, C<mboxrd>, C<mboxcl2>,
+C<mboxcl>, or C<mboxo>.
TODO: Update when URL support is added.
=item -f MAIL_FORMAT, --format=MAIL_FORMAT
-Message input format: C<eml>, C<mboxrd>, C<mboxcl2>, C<mboxcl>,
-C<mboxo>.
+Message input format. Unless messages are given on C<stdin>, using a
+format prefix with C<LOCATION> is preferred.
=item --stdin