You must include any documents that you changed in your return. For example if you updated W-2 information you would include this.
Line 18 of the
amended return should show the refund you are getting from your original
return. Line 21 should show the refund you are getting from the amended return.
How to track your
amended return: Allow 3 weeks from the mailing
date.
https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/wheres-my-amended-return-1
