Most CVs ignore this very simple point and it’s why recruiters will contact you about jobs that you’re not remotely interested in.
Recruiters will frequently have found your CV on an on-line database such as Reed or Indeed and think you look suitable for a job role they’re working on. This is based on what you’re doing right now or possibly on your previous job role.
However, you may well be looking to move out of the industry sector you’re in or change career direction completely. So don’t waste your time having to deal with irrelevant contacts from recruiters and put a one-liner in your Personal Profile saying what you’re looking for.
This also applies for direct applications that you make – tell the reader early on in your CV exactly why you’re applying for the job.