What does the exclamation mark next to a feature mean?

Feb 27, 2009 at 6:55 PM
What does the exclamation mark next to a feature mean:
http://employees.claritycon.com/pwalke/blogs/exclamation.jpg

Just downloaded this app.  Great work!  This is probably a noob question, but I don't see anything to indicate what that indicates.  All of my custom features that I deployed have this next to them.  It is also next to a few features in my site.

...Peter