+Arvados **requires** a Postgres database for its API server and SSL for communications. If you don't satisfy these two requirements, things
+won't work. It also uses an Nginx server as a redirector but probably almost any other webserver/redirector can be used instead.
+
+We suggest you use the `postgres-formula <https://github.com/saltstack-formulas/postgres-formula/>`_,
+the `nginx-formula <https://github.com/saltstack-formulas/nginx-formula/>`_ and the
+`letsencrypt-formula <https://github.com/saltstack-formulas/letsencrypt-formula/>`_ to install satisfy these dependencies.
+In the FIXME directory there are some example pillar YAMLs to set up these packages as Arvados needs it.
+
+Also, please note that the individual subcomponents `clean` states **won't remove the config**: as the config is common to all the suite
+components and they can be installed in the same host, removing it with a subcomponent might break others.
+
+If you want to remove the config in a host where you're removing a subcomponent, use the `arvados.config.clean` state after the
+`arvados.<subcomponent>.clean` state.
+
+The `arvados.clean` state will remove everything, config included, and can be used in any host to remove all of arvados files.