Pharrell Williams has surprised fans by announcing he will release a new digital book online on Thursday (24Apr14).

Just hours after the busy Happy hitmaker released the music video for his new single Marilyn Monroe, Williams also revealed that he is releasing a new, untitled book.

He has not provided many details, but took to on Wednesday (23Apr14) and wrote, "Happy…just finished my new book. You can only read it online. I’ll tweet the link on Thursday. Hope you enjoy."

This isn't the Grammy winner's first venture into publishing - he released Pharrell: Places and Spaces I've Been last October (13).