N.E.R.D dropped its first new song since 2014 on Wednesday with the Rihanna-assisted “Lemon.” It turns out the track was probably recorded in 2015, according to social media posts from frontman Pharrell Williams and Rihanna. After taking a look at the credits, more revealing information has come to light about the song. Namely, Chad Hugo and Shay Haley didn’t contribute to it.

According to the credits on TIDAL, Pharrell and Kuk Harrell produced “Lemon,” with Williams listed as the lone songwriter and composer. Fellow N.E.R.D members Chad Hugo and Shay Haley’s names are nowhere to be found. Of course, lesser known producers and songwriters go uncredited on a regular basis, but this seems unlikely to be the case here, as Hugo and Haley are full members of group.

Since “Lemon” is merely the first taste of N.E.R.D’s mysterious, unconfirmed project, there’s no reason to read too deeply into Hugo and Haley’s lack of involvement just yet. In any case, the trio is scheduled to headline ComplexCon later tonight, where they will likely premiere more new material — and perhaps shed some light on the origins of “Lemon.”

Prior to “Lemon,” N.E.R.D most recently contributed a trio of songs for the soundtrack to The Spongebob Movie: Sponge Out of Water in 2014.

Listen to the full song above and read all the lyrics to N.E.R.D’s “Lemon” featuring Rihanna on Genius now.