add note about missing openPgpProvider setting

        s.put("autocryptMutualMode", Settings.versions(

                new V(50, new BooleanSetting(false))

        ));

        // note that there is no setting for openPgpProvider, because this will have to be set up together

        // with the actual provider after import anyways.

        SETTINGS = Collections.unmodifiableMap(s);