Lender requesting "letter stating the amount of rent..."

[Eric Bette]

Hello all-

I'm in the process of getting a mortgage into underwriting as I'm negotiating the final details of a property I have under contract (closing on 2/15). 

The lender is requesting "letter stating the amount of rent you anticipate collecting for this property."

Could this be as simple as, "I, Eric Bette, anticipate rental income totalling $XX,XXX dollars per year from the property at 123 ABC St" ? Or is there a template I should be working from. 

Thanks for any input here. 

Eric