Any forms from your original return that change (besides your 1040) will probably need to be resubmitted as well.
If you used tax software to prepare your original return, it should be able to handle it easily.
When in doubt, read the instructions here:http://www.irs.gov/uac/Form-1040X,-Amen ... Tax-Returnhttp://www.irs.gov/instructions/i1040x/ch02.html
One relevant bit:
Assembling Your Return
Assemble any schedules and forms behind Form 1040X in order of the “Attachment Sequence No.” shown in the upper right corner of the schedule or form. If you have supporting statements, arrange them in the same order as the schedules or forms they support and attach them last. Do not attach correspondence or other items unless required to do so, including a copy of your original return.
Attach to the front of Form 1040X:
A copy of any Forms W-2, W-2c (a corrected Form W-2), and 2439 that support changes made on this return;
A copy of any Form W-2G and 1099-R that support changes made on this return, but only if tax was withheld; and
A copy of any Forms 1042S, SSA-1042S, RRB-1042S, and 8288-A that support changes made on this return.
Attach to the back of Form 1040X any Form 8805 that supports changes made on this return.
If you owe tax, enclose (do not attach) your check or money order in the envelope with your amended return. See the instructions for line 19, earlier.