Song Help Request Pls, help with the version of "Chocolate Jesus"

Hello,
I am the beginner, so, may be the question is some kind of silly one, but anyway...
Here's the link with the version of song "Chocolate Jesus":
http://www.youtube.com/watch?v=zxqXzjeC7Mk

All is clear there but I can't understand what he adds to Am chord (the second one)? Or it's not Am?

Hope to get some advice!
Thanks in advance.

This part?

CasanovaGuy said:

This part?

Code:

   Am
A|-----0---2-3-----|
E|-----0---------0-|
C|---0-------------|
G|-2-----2-----2---|

Click to expand...

Hippie Dribble said:

Click to expand...

Thanks a lot!!! Sure it is like this. Like a B7!!
Really thanks a lot!