One of the most common problems we see in data storytelling is how and when to introduce an editorial layer onto a visualization. Mobile devices afford us very little real estate to work with, and interactivity must be limited. But without a “story” layer, users are left without the context to understand what events might impact or inform a trend. They see something going up or down but don’t see why. “Storyline” will be a tool for creating stories around line graphs.