Showing the directory in the zsh prompt in OS X

This is pretty basic, but I've been using zsh for a little while and was unsure how to add the directory to the prompt.

zsh on Fedora does this by default - and bash on OS X too for that matter.

When figuring out how to do this, I first checked the PROMPT variable on Fedora's zsh.

This gave me something like [%m%~]%#

When adding this to OS X's .zshrc, however, this gave me an error.
Removing the square brackets fixed this, though, so I ended up with my ~/.zshrc looking like this:

export PROMPT=%m%~%# 

This will show the working directory in the zsh prompt.