Entering depreciation

[Carpetnailz]

I want to enter depreciation for my car. What's not clear to me is what
I should put into the 'Description' field. I will credit 'Assets:2012
VW' for the amount and debit 'Expenses:CarDepreciation'. 

Do I need to put something in the 'Description' field? Should I just
create an entity called 'Our Family'? Is there some standard way to do
this in accounting?

Thanks.