ESXi 6.7 as NTP-Server?

Hi all,

looks like I am somehow dumb....but:

How do I configure my ESXi hosts 6.7 as ntp-server for clients?

I found thousands of topics how to configure it to use a ntp server. But no one talks about how to be a ntp server.I found some articles how to do it in ESXi4 and 5, but these articles do not apply for 6.7

Any clues?

Thanks

/KNEBB