An unclassified document that is attached to a classified document should have a notation stating:

Question

Quizplus · Accepted Answer

A notation stating "Unclassified when separated from classified enclosure" should be used to indicate that the document is unclassified on its own, but becomes classified when it is attached to the classified document. This helps ensure that individuals handling the document are aware of its status and handle it appropriately.

An Unclassified Document That Is Attached to a Classified Document