This bill provides additional compensation to certain families and survivors of the September 11, 2001 terrorist attacks who have not yet received their full settlement payments. Specifically, it authorizes a lump sum catch-up payment equal to 5.8573 percent of eligible judgments to individuals who meet certain criteria but were previously left out of prior payment distributions. The bill applies to people determined to be eligible claimants under existing 9/11 victim compensation programs, including spouses and dependents. Within 90 days of the bill's enactment, the Special Master overseeing these payments must notify eligible claimants about their eligibility and provide a process for claiming the additional funds, with payments to be made within 90 days of verification. The legislation includes an open-ended appropriation to fund these payments, meaning Congress will provide whatever money is necessary to make all eligible payments without a specific dollar cap.