(Bloomberg) -- SpaceX CEO Elon Musk says “a lot has happened in 8 years” after a Twitter user sent out a 2013 memo from Musk on why he wanted to keep SpaceX private.

The memo Musk was commenting on said that volatility in stock prices causes workers to become distracted and that Tesla and SolarCity were public because “they didn’t have any choice.”

Musk wrote in the memo that the valuation of the company at the time was about $4 billion to $5 billion. In October, SpaceX hit a $100 billion valuation after a secondary sale.

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