Do you sometimes refer to X by its old name, Twitter? That’s okay. Even Elon Musk, the man who changed Twitter’s name to X, still occasionally refers to the social media platform he runs as Twitter.

“Twitter added far more features with fewer people,” said Musk in a post on X Monday.

The owner of X was responding to another account that praised DOGE, the advisory body on government efficiency which Musk leads, for its efforts to slash the federal workforce. This weekend, Musk told federal employees to detail their work accomplishments from the previous week by Monday or risk losing their jobs. However, a government official then told federal employees that those performance reports were optional.

“It worked for Twitter,” the account Musk responded to said.

This is not the first time Musk has called X by its former name, Twitter, and it likely won’t be the last.