In this talk, we will introduce a new tool called digodoc, that builds a graph of an opam switch, associating files, libraries and opam packages into a cyclic graph of inclusions and dependencies. We will then explain how we used that tool to build a documentation website that displays the generated documentation of a large set of opam packages from the official opam repository. Thanks to digodoc, users can easily navigate between module documentations, sources, packages and libraries. We think it is an interesting contribution to the OCaml ecosystem.