The Z-shell is a popular shell, especially under administrator. Command completion is essential for often used commands like "systemctl". A working version is already avaible at: https://github.com/foudfou/zsh-completion
We'd need a patch for this submitted, as nobody of us uses zsh.
It seems to be added in the meantime to zsh (git version): http://zsh.git.sourceforge.net/git/gitweb.cgi?p=zsh/zsh;a=commit;h=e5f1efa5
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.