Instead of building wireframes using tools like Balsamiq, this method suggests taking screenshots and marking those specific changes with Fat-marker method. You can use an iPad or screenwriters, or even using tools like PowerPoint / MS Paint is enough. The idea is to 'inform,' but without spending too much effort or time.
Eg: Adding a
> symbol next to an existing table, and marking
search on the left and
filter on the right side of the table, between Table and Title is clearer than a 100-word document.