How to prevent directory browsing through Yuns webserver

Hi,
when someone enters a directory on my Yun webserver and there is no index.(html, htm or php), this person can browse through the directory content.

How do I prevent this ?

Setup: no_dirlists - Do not generate directory listings if enabled

nano /etc/config/uhttpd
config 'uhttpd' 'main'
        option 'listen_http' '80'
        option 'home'        '/www'
	option 'no_dirlists' '1'
/etc/init.d/uhttpd  restart

@ Sonnyyu: Fantastic, problem solved !
Thanks a lot

After some googling (and after Sonnyyu provided the keyword no_dirlists), I found this website: Web Server Configuration (uHTTPd) [Old OpenWrt Wiki]

There one can find in detail how to configure the webserver (uhttpd).