Comments can be added to the definition of an event's actions (see screenshot below). This is useful for inserting explanations of the different actions in the definition of the event's actions.
You can customize the color of comment text. To do this, click the Comment Color icon in the event pane's toolbar and select a color from the color picker that appears. The selected color will be applied to all comments in all designs opened in MobileTogether Designer, including to comments that were defined prior to the setting of the new color.