Foo Fighters might be the mystery band on this year’s Glastonbury line-up after Dave Grohl seemingly dropped a hint in a letter to fans.

Grohl tweeted on Tuesday a handwritten note thanking fans for attending the band’s latest run of shows. “It feels good to see you, churning up these emotions together,” he concluded. “See you soon.”

Eagle-eyed fans have made the link between “churning up” and The ChurnUps—an unknown band that’s set to play Glastonbury’s Pyramid Stage on its Friday evening (6/23).

Foo Fighters headlined Glastonbury in 2017. They were originally booked to play in 2015 but had to pull out days before the performance due to Grohl suffering with a broken leg. If their slot for this year gets confirmed, they'll join acts including Elton John, Arctic Monkeys, Caroline Polacheck and Guns N' Roses on the bill.