How do I handle a long gap on my résumé? - 3 months and counting

I have been out of work for 3 months and worry about the gap. This is my first time dealing with any of this. I have done some volunteering and a course during that time. How did you handle it on your résumé?

Thanks for writing this out. I went through something close to it 3 months ago, and it settled down once I kept a simple log of every call and form.