+=head1 OPTIONS
+
+=over
+
+=item --reindex
+
+Forces a search engine re-index of all messages in the
+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.
+
+This does not touch the NNTP article number database.
+
+=back
+