Is code folding possible in prettydoc?

[ghost]

I was trying to add 'code_folding: hide' to my YAML header for prettydoc html output. The error I got was:

Error in overlay(...) :
You must use a theme when specifying the 'code_folding' option

I'm not sure what it means by specifying a theme, since I already had a theme (I used the architect theme). When I leave everything else the same, except instead I render it as a regular old html_document, the code_folding works.

Thank you! I love the prettydoc look!