-which is the smallest working Fedora installation. Use C<yum
-groupinfo Core> to list the packages currently in the C<Core> group.
+which is a small working Fedora installation (but by no means
+minimal). Use C<yum groupinfo Core> to list the packages currently in
+the C<Core> group.
+
+=item B<--no-clean>
+
+Normally febootstrap will clean up the yum repository
+(C</var/cache/yum> inside the image). This contains the downloaded
+RPMs and metadata. However if you give the C<--no-clean> option, then
+the yum repository is left. This is useful if you want to run further
+yum commands inside the filesystem by hand.