Update Event Payroll

I know this may seem a dumb question, but I have never had to do an STP Update event for our small business

I have processed our monthly payroll, but want to make an Additional Employer Superannuation Contribution for one employee.

If I do an update event, do I process another full payroll with the gross wages and tax etc. left in place, or do i remove all those figures and just have the one entry for the Additional Employee Superannuation Contribution for the employee.

Then send the update event with just that one line of payroll information...   There is no change to gross income or tax it is simply super.  Is that the right way to do this type of entry.

Thanks