2021 Form 5329 Waiver Explanation and efile

Hello all,

I missed my RMD for 2021 and have to file form 5329.  I have TT desktop edition and have successfully filled out form 5329 and the Waiver explanation. My question is will the waiver explanation efile with my return or do I have print and mail? If I have to print and mail do I have to mail the entire return or can I mail just form 5329 with the waiver?