Any doc reference on /entropy file ?

[Wojciech Puchar]

>
> -rw-------   1 root  wheel  4096 Dec 11 17:36 entropy
>
> I can't find any reference to that file in FreeBSD doc.
>
> Any reference to it ? What is it used for ? I have look in RANDOM area, but 
> no reference...

at startup it seeds random generator, every 11 minutes and at shutdown 
it's saved from random generator.

it's here to make random generator more random - not starting clean at 
boot.