repository. This can be used for in-place upgrades while
NNTP/HTTP server processes are utilizing the index. Keep in
mind this roughly doubles the size of the already-large
-Xapian database.
+Xapian database. Running L<public-inbox-compact(1)>
+afterwards is recommended to release free space.
This does not touch the NNTP article number database.
+=item --prune
+
+Run L<git-gc(1)> to prune and expire reflogs if discontiguous history
+is detected. This is intended to be used in mirrors after running
+L<public-inbox-edit(1)> or L<public-inbox-purge(1)> to ensure data
+is expunged from mirrors.
+
=back
=head1 FILES