XXX source code comments

Hi all,
I noted that the operating system source code contains several fragments of comments where each line begins with XXX:, as for example:

Code:
 * XXX: possibly collection point for statistics.                                         
 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.

I was wondering what does the XXX: mean (I guess it is something not definitive).
 
SirDice said:
It's easy to search for.

Of course it is, and I got that point. But searching for XXX in the whole source tree will not lead me to the comment I'm searching for because too many comments pops up. Or maybe I'm missing the point of such prefix.
 
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