LG G3 Clock > world clock > what do the yellow astericks mean?

[AC Question]

Looking at World Clock, I have 6 different locations set. The first two in my list have yellow astericks next to them.

Mountain View CA and London have astericks

Johannesburg, Jeddah, Tokyo and Syndey do not.

a few months ago, Sydney alone had a yellow astericks. Just curious what that means.