"Harry Potter and the Philosopher's Stone" celebrated its 20th-anniversary release on June 20. As part of the celebration, U.K. publisher Bloomsbury announced that they will be publishing two new Harry Potter books. The new books will be released in October to accompany the Harry Potter Exhibition: A History of Magic at the British Library.

The new books

Bloomsbury will be releasing two new background books: “Harry Potter: A History of Magic -- The Book of the Exhibition” and “Harry Potter -- A Journey Through a History of Magic.” The first book “The Book of the Exhibition” is reported to be about the subjects taught and studied and Hogwarts School of Witchcraft and Wizardry.

The second book, “A Journey Through a History of Magic,” is composed of stories about spells, magical creatures, and wizards and witches.

Unlike the other complimentary Harry Potter books, the 2 new books are not written by J.K. Rowling, according to Fortune. Bloomsbury has not yet revealed the cover art nor have they announced an exact release date yet.The exhibition at the British Library will be held from October 20, 2017 to February 28, 2018. There are no words yet from Scholastica Publishing house, which publishes the Harry Potter books in the U.S., regarding the new books.

Other supplementary books

In September 2016, J.K. Rowling wrote three stories about the Harry Potter world. The first book is “Power, Politics and Pesky Poltergeists” which is about the darker side of the wizarding world.

The story includes the history of Azkaban, the life story of Professor Umbridge, and the relationship between Tom Riddle and Professor Horace Slughorn.

The second book is “Heroism, Hardship and Dangerous Hobbies” which is about the heroic characters like Remus Lupin and Minerva McGonagall. The last book is “Hogwarts: An Incomplete and Unreliable Guide” which is about the history of Hogwarts.

In July 2016, “Harry Potter and the Cursed Child” was published. The “Cursed Child” is a West End stage play written by Jack Thorne based on a new story by Thorne, Rowling, and John Tiffany. The story is set nineteen years later after the events of the original series. The story follows Harry’s son, Albus Potter, who gets sorted into Slytherin with Draco Malfoy’s son Scorpius.

The script of the stage play was been released as books on July 31 – Harry and Rowling’s birthday. An updated version of the book, since revisions in the script were made, is to be released on July 25, 2017.

In 2001, J.K. Rowling published the complimentary books “The Tales of Beedle the Bard,” “Quidditch Through the Ages,” and “Fantastic Beasts and Where to Find Them.” The books benefit the charity Comic Relief. A film series based on the “Fantastic Beasts and Where To Find Them” was released on 2016, and the sequel is set to be released in November 2018.