Liverpool portfolio- should I include titles?

So I applied to study architecture at Liverpool and they've asked me for my portfolio, but since they only ask for 5 sheets of work I don't know if it would be appropriate to use subtitles like I did in other longer portfolios I've made. I'm worried they might be redundant and take up space. Has anyone included titles / subtitles in their portfolio?

You should include details about what the work in your portfolio is. Title, media, size and the brief it was in response to.
That can be as a caption or a title or a separate text box if you have multiple works on one page