How to update multiple domains with same IP address through OpenWRT please?

I know there is an sample configuration, do I just repeat the whole section with different domain?

Thanks!

Found a solution:

In the sample configuration file, delete line:
option domain 'YOUR-DYNU-HOSTNAME'

Modify line:
option update_url 'http://api.dynu.com/nic/update?hostname=[DOMAIN]&myip=[IP]&username=[USERNAME]&password=[PASSWORD]'

Replace [DOMAIN] with all you domains one by one separated by comma.

BTW, line
option lookup_host 'YOUR-DYNU-HOSTNAME'
is needed.

Above is not working, sorry.