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CHICAGO — Harry Potter author J.K. Rowling responded to a Twitter user who asked about a door to Hogwarts they spotted at a Chicago train stop.

Twitter user Michal Wilczewski posted a photo of a chalk-drawn door on the side of a building next to the Damen Blue Line stop. He asked the author if she could tell him more about it, according to the  Chicago Tribune.

“@jk_rowling can you tell me more about this door to Hogwarts at the Damen Blue Line stop in Chicago?” the Tweet said.

https://twitter.com/mehow87/status/989144207817367552

The author responded to Wilczewski and told him the entrance is for exchange students from Ilvermorny.

Ilvermorny is a North American wizarding school located at the top of Mount Greylock.

Rowling did not specify if the door takes students straight to Hogwarts or if a CTA train provides transportation.