What do the asterisks in the staging list mean?

[SebLavK]

I'm not sure if it's a new feature or it was there before. I've noticed an asterisk in some of the staging icons when building in the VAB/SPH, on the top left corner.

Sometimes they appear after rearranging the stages, or when adding new engines, decouplers, etc. At first I thought these meant that there some 'errors' in the order, like a decoupler that disconnected an engine further up in the staging list, but I found this to not be true.

I'm using the 64bit KSP 0.24, in case it's particular to this version. I'll try to upload an image if need be

[adisander]

As far as I'm aware that's been in the game for a while and simply means that the staging has been changed from the default, automatic order. I think they were less visible/a different color beforehand, but that's just off the top of my head.

[Tweety]

Someone correct me if I'm wrong, used to it now. I'm sure they highlight the 'experimental' parts.