Hello, form 8839 allows for you to deduct expenses related to adoption. If you adopted in 2015, you may have had this form on your 2015 taxes to help deduct these expenses.
This link has more information on form 8839: https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Forms/What-Is-IRS-Form-8839--Qualified-Adopti...