Deductions & credits

"Another option is to file married filing jointly. Since an NRA can not do that, both spouses need to sign a statement that they both choose to treat the NRA spouse as a resident alien for the entire year. This allows them to file jointly. The choice is valid for any following year unless suspended or revoked."

Simple question:  This is the simplest option for me.  Does the statement have to be notarized or anything, or do I just include it with my taxes?