Workflow on Tasks, use of related Contact

Workflow on Tasks, use of related Contact

Hi,

I'm trying to create a workflow related to the modification of a task: When the task status is changed to "Done", I would like the related contact person (logged in Contact module) to be sent an email.

when I set up the alert by email, the only fields available from Contact is "Contact creator" and "Contact owner", but not the contact himself.

Could it be possible to clarify how can I work that out?

Thanks