Sierra Designs Light Year CD Tent- Extra Part??? from 2001??

[keepinitsimple]

Help, So I have not opened my 1 man tent in years, I put it up in the yard last night and had an extra tri-angular sheet. So I went on the website, looked in the manual and found nothing. I estimate it could be part of the vestibule, but cant figure out how, where it attaches. If I could find a photo of it in place I could figure it out, or if anyone could share experience? Cause at this point it aint going in the pack for my "MD 3-day, knock out the state" trip in late June

Thanks

[Franco]

it would help if you posted a picture of it in relation to the rest of the tent.
Franco