C.R.S. § 15-2.5-206
15-2.5-206. Power of the donor to revoke or amend
15-2.5-206. Power of the donor to revoke or amend. (1) A donor may revoke or amend a power of appointment only to the extent that:
(a) The instrument creating the power is revocable by the donor; or
(b) The donor reserves a power of revocation or amendment in the instrument creating the power of appointment.