Where to place zsh autocompletion script on Linux?

After installing cheat (command cheat sheets from the command line), I tried to enable the autocompletion using the provided zsh script. However, I don't seem to find the correct location for the script.

So far

• I fetch the cheat.zsh ;
• copy it to ~/.oh-my-zsh/custom/plugins/cheat/_cheat.zsh ;
• add the cheat to the plugins array in my ~/.zshrc ;
• reload my shell.

Auto-completion doesn't happen when typing cheat d<TAB>.

Question

So where to place zsh auto-completion script on Linux?

I got this to work by adding cheat.zsh to the ~/.oh-my-zsh/plugins directory. Zsh checks to autoload functions on FPATH, so try:

echo $FPATH

and then either add to FPATH or move the file into a folder on the path.

This actually does a much better job of explaining it: https://unix.stackexchange.com/questions/33255/how-to-define-and-load-your-own-shell-function-in-zsh