Nginx on OpenBsd

[PapaParrot]

I am not sure this is the best place for this topic, so if it gets moved , no problem.

Using Nginx, on a server powered with OpenBsd, and I read in the documentation,
for better security, by default it does not show the contents of a directory like this:
(Apache) for example: http://rockyandtheparrots.org/images/
I would like to do the same on Nginx, but only for the directory I specify, hoping
that makes sense.
At this time for example I get : http://www.parrotsandopenbsd.org/images/

403 Forbidden
nginx

Thank you