Mmmm... I do not want to sound crude, but what would they put? The device actually works in Windows XP, Vista and 7 (tried it personally on the three: I can't speak about older Windows versions), in Linux systems (tried it personally in Ubuntu and Puppy), and in Mac (no personal experience, as I've got no Mac to try
). The only flawed case is this one, the fact that it seems not to plug correctly on older versions of Mac... Of course, it must be addressed (and as you can see, Pocketbook does address it), but in my opinion it's overkill to put a "list of OSes in which it works", as the only issue comes with Tiger 10.4 in Mac. In fact, a footnote saying "beware with older Mac versions" is fair enough.
Nevertheless, you bring a good topic: Pocketbook's literature is sadly lacking in English. Even developers have complained about the lack of documentation.