+=item --no-fsync
+
+Disable L<fsync(2)> and L<fdatasync(2)>.
+See L<public-inbox-index(1)/--no-fsync> for caveats.
+
+Available in public-inbox 1.6.0+.
+
+=item --sequential-shard
+
+Copy each shard sequentially, ignoring C<--jobs>. This also
+affects indexing done at the end of a run.
+
+=item --batch-size=BYTES
+
+=item --max-size=BYTES
+
+See L<public-inbox-index(1)> for a description of these options.
+
+These indexing options indexing at the end of a run.
+C<public-inbox-xcpdb> may run in parallel with with
+L<public-inbox-index(1)>, and C<public-inbox-xcpdb> needs to
+reindex changes made to the old Xapian DBs by
+L<public-inbox-index(1)> while it was running.
+