#1 - Red
#2 - Yellow
#3 - Green
#4 - Light Blue
#5 - Blue

The above is the usual way people will use and see cuepoints...

Now If you have a track with no cue points and you assign #2 first and say #1 second the #2 gets color Red and #1 is now Yellow. This makes it a tad confusing and in a situation where you should make the decision fast you might hit the wrong key if you remember the color-to-number association (which is what i do).