RMD non-distribution

I forgot to make an RMD for last year.  Which would be better for IRS processing (and me!):

1. Prepare 5329 with written excuse and  snail mail to IRS; then do 1040 as usual and E-File, or

2. Just do 1040 and hope I can find 5329 in Turbo Tax to electronically E-File; and, if so, how would I send my separate written excuse?

 

thanx,

steve