32 C.F.R. § 2001.10
Identifying or describing damage to the national security. Section 1.1(a) of the Order specifies the conditions that must be met when making classification decisions. Section 1.4 specifies that information shall not be considered for classification unless its unauthorized disclosure could reasonably be expected to cause identifiable or describable damage to the national security. There is no requirement, at the time of the decision, for the original classification authority to prepare a written description of such damage. However, the original classification authority must be able to support the decision in writing, including identifying or describing the damage, should the classification decision become the subject of a challenge or access demand pursuant to the Order or law.
32 C.F.R. §2001.10