Nerdy Muggles, rejoice: There’s a new set of extra Harry Potter textbooks for you to read, just in time for fall term at Hogwarts.

On Sept. 6, Pottermore, J.K. Rowling's official portal to her Wizarding World, will release three e-book shorts on the secret history of Hogwarts. Each story will combine details from Pottermore archives with new material from Rowling to give new background on the school. So if you ever wondered how a witch becomes a portrait or longed for a biography of Care of Magical Creatures teacher Silvanus Kettleburn, you’re in luck.

These three shorts join a ever-expanding universe of Rowling-sanctioned Harry Potter ephemera (in addition to plenty of fan fiction): Harry Potter and the Cursed Child, the script of the play which premiered in July; Fantastic Beasts and Where to Find Them, the movie which will be released in November; and three supplementary books published alongside the original series. Rather than write new material set in a new world, Rowling continues to elaborate on her original wizarding one, providing a literary Pensieve for readers to return to the Hogwarts School of Witchcraft and Wizardry. And that will always be Rowling's greatest trick: keeping 'em coming back for more.