She looked back to find him regarding her with a pleased expression on his face. "We actually have nearly thrice the number of books. It’s the largest private collection in Wizarding Europe," he boasted, although his tone lacked the "I’m-better-than-you-and-I-know-it’ smugness of his youth. "But of course, that factoid wasn’t included in  Hogwarts, A History  so I’m not surprised you weren’t aware."