To amend your federal tax return - use form 1040X - http://www.irs.gov/pub/irs-pdf/f1040x.pdf
Be sure to enter the year of the return you are amending at the top of Form 1040X. The form has three columns. Column A shows original or adjusted figures from the original return. Column C shows the corrected figures. The difference between Columns A and C is shown in Column B. There is an area on the back of the form to explain the specific changes being made and the reason for each change.
Because - there is no difference - all amounts in columns A and C will be same and in column B will be zeros.
If you decide to amend - you need to attach form W2C to your amended tax return.