Thanks, wrc. You have a point that the subtitle on the book cover itself should give away that it is non-fiction, so probably the genre (which, however, will not be a "suspenseful love story" :-) ) is not necessary on the title page.
Thanks also for the encouragement. My book is in its last stages, but nonetheless will still not be published for a few months, since I am off on a three-month voyage, during which the manuscript will be meticulously proof read by someone else. (Does one still say "manuscript" for a digital copy?)