Only L<public-inbox-v2-format(5)> inboxes are supported.
+This is safe to run while normal inbox writing tools
+(L<public-inbox-mda(1)>, L<public-inbox-watch(1)>,
+L<public-inbox-learn(1)>) are active.
+
+Running this in parallel with L<public-inbox-xcpdb(1)> or
+C<"public-inbox-index --reindex"> can lead to errors or
+purged data remaining indexed.
+
+Incremental L<public-inbox-index(1)> (without C<--reindex>)
+is fine.
+
+Keep in mind this is a last resort, as it will be disruptive
+to anyone using L<git(1)> to mirror the inbox being purged.
+
=head1 CONTACT
Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>
=head1 COPYRIGHT
-Copyright 2019 all contributors L<mailto:meta@public-inbox.org>
+Copyright 2019-2020 all contributors L<mailto:meta@public-inbox.org>
License: AGPL-3.0+ L<https://www.gnu.org/licenses/agpl-3.0.txt>