Enables space savings when the remote C<manifest.js.gz>
includes C<forkgroup> entries as generated by grokmirror 2.x.
-If C<DIR> is not an absolute path, it is relative to the
-C<DESTINATION> directory. If only C<--objstore=> is specified
-where C<DIR> is an empty string (C<"">), then C<objstore>
+If C<DIR> does not start with C</>, C<./>, or C<../>, it is treated
+as relative to the C<DESTINATION> directory. If only C<--objstore=>
+is specified where C<DIR> is an empty string (C<"">), then C<objstore>
(C<$DESTINATION/objstore>) is the implied value of C<DIR>.
+=item --manifest=FILE
+
+When incrementally updating an existing mirror, load the given
+manifest (typically C<manifest.js.gz>) to speed up updates.
+
+By default, public-inbox writes the retrieved manifest to
+C<$DESTINATION/manifest.js.gz>, this directive also
+changes the destination to the specified C<FILE>
+
+If C<FILE> does not start with C</>, C<./>, or C<../>, it is treated
+as relative to the C<DESTINATION> directory. If only C<--manifest=>
+is specified where C<FILE> is an empty string (C<"">), then C<manifest.js.gz>
+(C<$DESTINATION/manifest.js.gz>) is the implied value of C<FILE>.
+
+=item --project-list=FILE
+
+When cloning code repos from a manifest, generate a cgit-compatible
+project list.
+
+If C<FILE> does not start with C</>, C<./>, or C<../>, it is treated
+as relative to the C<DESTINATION> directory. If only C<--project-list=>
+is specified where C<FILE> is an empty string (C<"">), then C<projects.list>
+(C<$DESTINATION/projects.list>) is the implied value of C<FILE>.
+
+=item --post-update-hook=COMMAND
+
+Hooks to run after a repository is cloned or updated, C<COMMAND> will
+have the bare git repository destination given as its first and only
+argument.
+
+For v2 inboxes, this operates on a per-epoch basis.
+
+May be specified multiple times to run multiple commands in the
+order specified on the command-line.
+
+=item -p
+
+=item --prune
+
+Pass the C<--prune> and C<--prune-tags> flags to L<git-fetch(1)>
+calls on incremental clones.
+
+=item -k
+
+=item --keep-going
+
+Continue as much as possible after an error.
+
=item -n
=item --dry-run