=head1 NAME
-public-inbox-xcpdb - copy Xapian DBs (for format upgrades)
+public-inbox-xcpdb - upgrade Xapian DB formats
=head1 SYNOPSIS
This is intended for upgrading the database format used by
Xapian. It DOES NOT upgrade the schema used by the
-public-inbox search interface (see L<public-inbox-index(1)>).
+public-inbox PSGI search interface (see
+L<public-inbox-index(1)>).
=head1 ENVIRONMENT