+*--keep_src_list*::
+ Do not overwrite user provided /etc/apt/sources.list.
+
+*-m*, *--mirror* <_URL_>::
+ Specify mirror which should be used for apt-get/aptitude. Notice that
+ specifying the mirror also sets the chrootmirror to the given value.
+ Corresponding with configuration variables MIRROR and CHROOTMIRROR.
+