There are multiple ways to add explanatory text and other enhancements to videos you create or find elsewhere, which can be a powerful way to deepen students' understanding and increase the efficiency of the time they spend watching materials. ThingLink is most effective for adding constructed annotations, while CarmenZoom is the simplest way to record mark-up and annotations created in the moment. NOTE: there are nuances and challenges involved in generating annotated multimedia, and it can be especially helpful to meet with an instructional designer for input and support.