Colour index

It would It would be very useful to have a colour index to indicate what each colour means in the context of the individual model. Ideally you would be able to have an interface (e.g. side panel) to define a custom text for each colour. You should then be able to add a colour index element on the canvas. This would allow anyone looking at the canvas (especially SVG exports of the canvas) to see the meaning of the colours (e.g. Blue for Sales, Green for Engineering etc.). Even though you could use swimlanes for some of it, it is very useful to be able to see this visually.,