UK visit visa: employment

I'm currently completing the application for my sister in law to visit us; and it's changed since the last time she did so.

I'm stuck on one question. name address and contact details of employer.

The help note says

Please enter details of the address and contact details of your place of work/employer. You must enter at least one contact phone number

The problem is she is self employed, doing casual work for various people on an ad hoc basis.

I've put, as last time, that she is self employed, so should I put her details here?

I assume that should be ok; but would like confirmation.

Thanks.