E----------------------------3h5-3------------------1----1------1----|
B--------6p5-----------------------3h5-3----------1------1h3----3p1--|
G------5-----7-5----------3---------------3-----3--------3------3----|
D---7-------------7\----5---------------------3----------3------3----|
A-5-------------------3---------------------1------------1------1----|
E--------------------------------------------------------------------|
for the knock part play natural harmonics on the 5th fret as a chord for the D,G,and B strings.
[ Tab from: http://www.guitaretab.com/t/trey-songz/222869.html ]
