Question for workflow related to Quality Notifications (QN)

Hello all,

We have workflow configured in such a way that it triggers workflow for sending an email  when a task is released in quality notification.

Now we want a new workflow mail to be sent to be configured if the task in the QN is closed.

Please suggest a procedure how can I achieve this , I know that we need to activate the trace and check in SWI1 for the possible workflows that are triggered.

Thanks,

Balu