A biography on Elon Musk, the billionaire entrepreneur who runs Tesla and SpaceX, was published in 2015 but seemingly, the man has only just read a copy (or maybe he read it earlier but was provoked now by a Business Insider tweet). And while he called the book “mostly correct,” Musk took issue with some of the anecdotes in it, particularly its depiction of how he parted ways with his long-time assistant Mary Beth Brown.

Titled “Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future,” the biography was written by Ashlee Vance, a business columnist. In the book, Vance said Musk gave his assistant a two-week leave when she asked him for a significant raise, during which time he would assess the nature of her duties. When she returned, Musk told her she was no longer needed, gave her 12 months’ salary as severance package and never spoke to her again. According to the book, Musk offered her another job at the company (SpaceX), but she never returned to the office again.

TRENDING: Apples Postpones September Launch Of iPhone 8

In a series of tweets Thursday night, Musk contested this version of events, calling this one “of all the bogus anecdotes” in the book, the one that “troubles” him the most.

While the barrage of tweets began as a reply to a Business Insider story, Musk also took a shot at TIME for writing a story based on the same anecdote.

Maye Musk, Elon’s mother, got into the fray as well, agreeing with her son and calling some of the book’s contents “glaringly wrong.”

Soon after the book was first published, Musk’s ex-wife Justine Musk wrote about an incident between her and Musk, and without taking sides, compared it with the alleged way in which Mary Beth was fired.

“This reminds me of something similar he once said to me, many years ago, after I came back from a week's visit with my family in Canada -- that his life had operated quite smoothly in my absence.  He was letting me know that I was an incompetent house manager. (He was not wrong.)  So of the different stories I have heard behind MB's departure from SpaceX, this is the one that resonates with me. (Although you would *never* use the word 'incompetent' in association with MB!),” she wrote on Quora.

But it wasn’t all seriousness. Musk made light of some other anecdotes he said were wrongly presented in the book.

POPULAR NOW: Video Shows Stingray Eating A Squid

And when someone asked him what he saw himself as, if not a ninja, his reply implied that among his other talents, Musk is perhaps good at tailoring too.

Another Twitter user asked him if there was a list of “bogus anecdotes” from his biography.

Someone else then asked Musk about updates to his latest venture, the Boring Company that plans to drill tunnels in urban areas to speed up public transport.

With the Tesla Model 3 just rolled out, an upcoming Falcon 9 launch Monday that will carry a Dragon resupply mission to the International Space Station, and the first Falcon Heavy test scheduled for November, Musk has a lot to keep him occupied while he waits for Godot.