C.R.S. § 4-9-512

(a) Subject to section 4-9-509 , a person may add or delete collateral covered by, continue or terminate the effectiveness of, or, subject to subsection (e) of this section, otherwise amend the information provided in, a financing statement by filing an amendment that: (1) Identifies, by file number, the initial financing statement to which the amendment relates; and (2) Provides the date that the initial financing statement was filed or recorded. (b) Except as otherwise provided in section 4-9-515 , the filing of an amendment does not extend the period of effectiveness of the financing statement. (c) A financing statement that is amended by an amendment that adds collateral is effective as to the added collateral only from the date of the filing of the amendment. (d) A financing statement that is amended by an amendment that adds a debtor is effective as to the added debtor only from the date of the filing of the amendment. (e) An amendment is ineffective to the extent it: (1) Purports to delete all debtors and fails to provide the name of a debtor to be covered by the financing statement; or (2) Purports to delete all secured parties of record and fails to provide the name of a new secured party of record.