-Source packages consist of either two or three files: a
-<filename>.dsc</filename> file, and either a <filename>.tar.gz</filename> file
-or both an <filename>.orig.tar.gz</filename> and a
-<filename>.diff.gz</filename> file.
+Depending on the format of the source package, it will consist
+of one or more files in addition to the mandatory <filename>.dsc</filename>
+file:
+<itemizedlist>
+<listitem><para>with format “1.0”, it has either a <filename>.tar.gz</filename>
+file or both an <filename>.orig.tar.gz</filename> and a
+<filename>.diff.gz</filename> file;</para></listitem>
+<listitem><para>with format “3.0 (quilt)”, it has a mandatory
+<filename>.orig.tar.{gz,bz2,lzma}</filename> upstream tarball,
+multiple optional <filename>.orig-<replaceable>component</replaceable>.tar.{gz,bz2,lzma}</filename>
+additional upstream tarballs</para>
+<para>and a mandatory <filename>debian.tar.{gz,bz2,lzma}</filename> debian tarball;</para></listitem>
+<listitem><para>with format “3.0 (native)”, it has only
+a single <filename>.tar.{gz,bz2,lzma}</filename> tarball.</para></listitem>
+</itemizedlist>