4-month résumé gap, advice? - any advice?

I have been out of work for 4 months and worry about the gap. I have done some volunteering and a course during that time. What do you say in interviews?

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.

I was hired after a 4-month gap. The manager said the skills test mattered more than the dates.