Change Meeting/Call Reminder Template to include Description value?

What variable am i to use to add the meeting 'description' to the template? My change looked like this:

<!-- BEGIN: MeetingReminder_Subject -->
Meeting Reminder - {MEETING_SUBJECT}
<!-- END: MeetingSpecial_Subject -->
<!-- BEGIN: MeetingReminder -->
Title: {MEETING_SUBJECT}
When: {MEETING_STARTDATE}
Location: {MEETING_LOCATION}
Created By: {MEETING_CREATED_BY}
Description: {MEETING_DESCRIPTION} <!-- change made here -->
<!-- END: MeetingReminder -->

From what i could gather, that was all i needed to add. So it seems like i may be using the wrong variable within the brackets? This is my question. I know that i can change the Meeting template that is used when the Meeting invitation is originally sent out. I am talking about the subsequent reminders, my client wants those to have a description as well.