Mention GMON_OUT_PREFIX in gprof(1) man page?

[Gary Hade]

On systems that use glibc, the name of the profile data file 
(default: gmon.out) can be modified by setting the environment
variable GMON_OUT_PREFIX.  The modified file name is of the form:
    <contents of GMON_OUT_PREFIX>.<pid>
This feature is very handy when profile information is needed
for a forked process.

GMON_OUT_PREFIX is not documented in the gcc(1) man page, 
gprof(1) man page, or any other document I have been able 
to locate, other than email messages.

I believe the gprof(1) man page would be a good place to 
provide documentation exposing this feature.  Would a change 
to the gprof(1) man page describing GMON_OUT_PREFIX be acceptable?

Thanks,
Gary