Heenadarji

Hello
I had also same mistake and submitted on 26th March. I haven't get any review from them yet.
So is it better to write or leave that as it is? 
What did you write in that letter and where did you submit ? 

Thank you all for your quick response.
I have another doubt also.
If we are adding joint sponsor (2nd time), then should we provide the relationship proof between sponsor and petitioner?
I am submitting form i864a also, so should i provide the relationship proof between joint sponsor and his household member? 
And please also tell, which documents i have to attach for form i864a?