I want to put a descriptive name under the name in a signature:
I currently have:
\def\sig#1{\vbox{\hsize=5.5cm
\kern2cm\hrule\kern1ex
\hbox to \hsize{\strut\hfil #1 \hfil}}}
\newcommand\signatures[4]{%
\hbox to \hsize{\hfil #1, \today\hfil}
\hbox to \hsize{\quad\sig{#2}\hfil\hfil\sig{#3}\quad}
\hbox to \hsize{}}
\signatures{Institution}{Name 1}{Name 2}{}
which is :

But I want:

What should be added to the code to show that?
I call it using
\signatures{Institution}{Name 1}{Name 2}{}
