Doctrine of Incorporation By Reference

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In regard to wills, the doctrine of incorporation by reference means that unattested papers (papers not present when the will was executed) can still be regarded as part of the will by incorporation. A writing that is not valid as a will but is in existence when a will is executed may be incorporated by reference into the will if the will manifests an intent to incorporate the writing and the writing to be incorporated is identified with reasonable certainty.  

Restatement (Third) of Property § 3.6 (1999), Uniform Probate Code § 2-513 (2006)