Catalina zsh release notes

I'm unaware of a specific reference to the shell change in Catalina release notes, and a quick search did not turn up anything relevant.

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Apple is not long on any form of release notes. Are you seeking the zsh 5.8 manual, individual zsh (man zsh) man pages, or the consolidated (man zshall) man page? That is not a typo. Or do you have a specific question about achieving something in zsh?

Hi, cmtopinka.

The Terminal shell zsh is part of the Catalina install.

When you launch the Terminal app, you should be prompted to change your default shell from bash to zsh.

If you don't see that, see this:

Change the default shell in Terminal on Mac - Apple Support