Display comments on actions in the workflow designer

When building large, complicated workflows, it would be handy to have a comments option displayed on the workflow designer page, without the need to open the right-hand context panel.
Use case for this would be to use as a reminder of what a step does, why the step exists, or something as simple as being able to say things like "Need to add X variable to form screen once created" or "not completed" to remind the designer of work still to be done.