An addendum is a supplementary document attached to a contract that modifies, clarifies, or adds terms to the original agreement without replacing it.
| Element | Description |
| Attachment | Separate document |
| Timing | Added after initial contract |
| Binding | Legally enforceable |
| Signatures | Required from all parties |
| Common Use Cases | Application |
| Price adjustments | Changes to purchase price |
| Timeline extensions | Completion date modifications |
| Specification changes | Unit modifications |
| Payment terms | Revised payment schedules |
| Additional conditions | New requirements or clauses |
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