Updates the description of a KMS key. To see the description of a KMS key, use DescribeKey.
The KMS key that you use for this operation must be in a compatible key state. For details, see Key states of KMS keys in the Key Management Service Developer Guide.
Cross-account use: No. You cannot perform this operation on a KMS key in a different Amazon Web Services account.
Required permissions: kms:UpdateKeyDescription (key policy)