Ellie, a marathon runner, discovered a note from Ariana Grande in an envelope after finishing the race. The note, written by Grande and her boyfriend Ricky Alvarez, read 'You did it!' with three hearts. Ellie had been listening to Grande's music during the race.

Ella Schweiger, a creator from Manchester, brought her project, Ella's Envelope, to New York for the marathon. The project collects notes from strangers to give to runners. Grande and Alvarez agreed to write notes for the project while watching the race. Read more culture coverage.

Ellie was unaware of the note's origin until Schweiger informed her. The runner expressed surprise and gratitude for the note, which she found after crossing the finish line. The marathon saw a record 61,146 finishers. Related: NYC Marathon Sets Record with Over 60,000 Finishers.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.