Supplemental disclosure is updated disclosure provided when new information becomes available, when prior information changes, or when the disclosing party realizes their initial disclosure was incomplete. The duty to supplement runs throughout the case.

Common supplemental disclosure triggers include a new job, a changed income, a new financial account, new property acquired during the case, updated account statements, and new witnesses or documents.

Failing to supplement disclosure when required creates the same problems as failing to provide initial disclosure. The cure for an oversight is to supplement immediately when the oversight is discovered.