  \dirtree{%^^A
    .1 [doc/user-guide]\DTcomment{the root path for the \SKB~documentation}.
      .2 database\DTcomment{acronyms and references are here}.
      .2 examples\DTcomment{all of our examples are here}.
      .2 figures\DTcomment{one PDF example and some dirtree figures}.
      .2 repository\DTcomment{the actual content of user guide and slides}.
        .3 exa-doc\DTcomment{everything describing the documentation}.
        .3 getting-started\DTcomment{the general package description}.
        .3 manual\DTcomment{the user manual, macro descriptions}.
        .3 separate\DTcomment{the concept of separation in the \SKB}.
        .3 story\DTcomment{the story, short and long}.
      .2 slides\DTcomment{all beamer frames for the presentations}.
  }