Burn Down Chart showing additional scope requirements

[Mae]

Hi, 

Need your help in understanding on how to show the additional scope/ requirements in Agile Burndown chart. 

Suppose there are 5 new requirements for Sprint 3, it will be shown as -3 (bottom) of the Sprint 3 bar.  Question is do we still need to show this new requirements bar consistently for the remaining sprint bars, e.g.  for Sprint 4, Sprint 5?  Or -3 bar should only be displayed for Sprint 3 bar only?

Thanks in advance.

JS