=over
-=item --jobs=JOBS, -j
+=item -j JOBS
+
+=item --jobs=JOBS
... TODO, see L<public-inbox-index(5)>
+=item --all
+
+Index all C<publicinbox> entries in C<PI_CONFIG>.
+
+C<publicinbox> entries indexed by C<public-inbox-extindex> can
+have full Xapian searching abilities with the per-C<publicinbox>
+C<indexlevel> set to C<basic> and their respective Xapian
+(C<xap15> or C<xapian15>) directories removed. For multiple
+public-inboxes where cross-posting is common, this allows
+significant space savings on Xapian indices.
+
+=item --gc
+
+Perform garbage collection instead of indexing. Use this if
+inboxes are removed from the extindex, or if messages are
+purged or removed from some inboxes.
+
+=item --reindex
+
+Forces a re-index of all messages in the extindex. This can be
+used for in-place upgrades and bugfixes while read-only server
+processes are utilizing the index. Keep in mind this roughly
+doubles the size of the already-large Xapian database.
+
+The extindex locks will be released roughly every 10s to
+allow L<public-inbox-mda(1)> and L<public-inbox-watch(1)>
+processes to write to the extindex.
+
+=item --fast
+
+Used with C<--reindex>, it will only look for new and stale
+entries and not touch already-indexed messages.
+
=back
=head1 FILES