“Twenty years ago today, a world that I had lived in alone was suddenly open to others. It’s been wonderful. Thank you,” Rowling wrote early Monday.
The author used the special #HarryPotter20 hashtag, which automatically includes a new Potter-centric Twitter emoji (a lightning bolt and rounded glasses, to represent Harry Potter himself) when posted.
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The release of Harry Potter and the Philospher’s Stone (later retitled Harry Potter and the Sorcerer’s Stone for U.S. audiences) in 1997 launched the Potter franchise, which numbers seven total books, eight movie adaptations (the final book, The Deathly Hallows, was split into two parts for theatergoers), and additional material (including the spinoff film, Fantastic Beasts and Where to Find Them, and the sequel play, Harry Potter and the Cursed Child).
That Rowling offered a message to fans via her Twitter account on Monday is fitting as well. The author has become prolific on the social media platform, frequently revealing new information about the series she created in 140 characters or less.
This article originally appeared on Ew.com