The IRS Form 3468, Investment Credit would be included with your federal tax return provided you entered the type of property eligible for the tax credit.
IRS website for a form 3468 - https://www.irs.gov/forms-pubs/about-form-3468
Investment credit property is any depreciable or amortizable property that qualifies for the qualifying advanced coal project credit, qualifying gasification project credit, qualifying advanced energy project credit, advanced manufacturing investment credit, energy credit, or rehabilitation credit.