I installed letsencrypt cetificate but which steps do I need to take to renew it when it expires?

I followed this fantastic tutorial and got my domain running under https succesfully.

But when the certificate expires in may, what do i need to do?

Do I just need to run the following command to renew it and all the configuration i did already is still valid:

sudo letsencrypt certonly -a webroot --webroot-path=/var/www/html -d example.com -d www.example.com

Or do I need to go through the rest of the steps?