Taylor Swift attends The 58th Grammy Awards

Taylor Swift attends The 58th Grammy Awards at Staples Center on Feb. 15, 2016 in Los Angeles.

Dan MacMedan/WireImage

So long, Nils. Nice knowing you.

Less than a week after it was revealed that Taylor Swift secretly co-wrote ex-boyfriend Calvin Harris' "This Is What You Came For" under the pseudonym Nils Sjöberg, the official BMI credit on the song has been changed.

It's unclear when the switch happened, but Sjöberg is now gone and Swift is officially listed as the co-author of the worldwide smash featuring Rihanna's vocals. Harris confirmed Wednesday that he wrote the music, produced the track and arranged the vocals and that Swift "initially" wanted to keep things on the DL, but that she sang on the track "a little bit."

Taylor Swift Co-Wrote Calvin Harris' 'This is What You Came For' Under Swedish Pseudonym

What started out as a juicy secret revealed, with Harris calling Swift an "amazing lyric writer," quickly turned ugly when the producer/DJ went on a Twitter rant lashing out at Swift and her team for the "hurtful" way the news came out. "Hurtful to me at this point that her and her team would go so far out of their way to try and make ME look bad at this stage though," he tweeted. 

Calvin Harris Says It's 'Hurtful' That Taylor Swift's Team is 'Trying to Make Me Look Bad'

Spokespeople for Swift and Harris could not be reached for comment on the credit switch at press time. Though the change in the track's BMI status won't have an impact on how much each artist takes home from the song's sales and performance, it does draw a historical line in the sand by clearly defining who the track's real authors were and adding yet another twist to its origin story.