Additional info section for extracurricular activities

Hey everyone, just a quick question. Is the additional info section a good place to elaborate on extracurriculars that did probably weren’t explained enough in the actual activities section. It’s for an internship that I completed, and there were many components to it. For my other two major activities, one I wrote common app about and the other I have a letter of rec, but for the internship I don’t have anything besides the 150 characters in the activities section.