pthread option documentation

[NightStrike]

I'm a little confused on the documentation of the -pthread option.
I'm posting to gcc-help because I assume by default that I'm just
misunderstand things :)

http://gcc.gnu.org/onlinedocs/gcc/Option-Index.html

On that page, if you scroll down to pthread, the option appears to
only apply to a couple of weird targets:

Solaris 2
RS/6000
PowerPC

But yet I've used this on many platforms, and I have found it to be
required to use pthreads on linux.  Am I reading the docs wrong?