[Pw_forum] How to use upftools ( where is the manual about upftools)

[yukihiro_okuno at fujifilm.co.jp]

Dear PWscf usrs.

I've just started to use PWscf.
So, sorry such a basic question like below.

I want to use pseudo-potential of Bi.
But there are no Bi pseudo potential.

So I want to use Vanderbilts's code to generate pseudo potential
and convert to upf format by upftools.

But I can't found the manual about upftools in PWscf directory.
Where is the manual on upftools which I should read,
( I also use virtual crystal approximation so, I want to use virsual.x)
and how to use vdb2upf.x

Sincerely