(a) A powerholder may revoke or amend a release of a power of appointment only to the extent that: (1) The instrument of release is revocable by the powerholder; or (2) The powerholder reserves a power of revocation or amendment in the instrument of release.
Revocation or amendment of release
D.C. Code § 19-1704.04, under Disclaimer or Release; Contract to Appoint or Not to Appoint..
D.C. Code § 19-1704.04