Proof of US Domicile for I-864a

[tereava]

Hi,

I'm submitting an I-864a as a household member for my husband's petition for his mother. The ceac system shows that I'm required to submit proof of U.S. domicile. I'm not sure why I need to submit this since I'm a US citizen and have lived here my whole life, and other documents that we've submitted (2017 tax return and our marriage certificate) show my address in the US. What type of document would be best to submit for this? I can't find any information on what can be used for proof of U.S. domicile in the form's instructions. Would a copy of my drivers license or passport work?

Thanks in advance for any help!

[krypton9591]

https://www.uscis.gov/i-864

[tereava]

https://www.uscis.gov/i-864

Thanks for responding, but the instructions don't provide examples of what kind of document they accept for this, and I was hoping that someone could help me out with that.

I guess I'll try submitting recent bills with my address and a copy of my drivers license, and hope it's sufficient.