Colo. Rev. Stat. § 38-35-108
When a deed or any other instrument in writing affecting title to real property has been recorded and such deed or other instrument contains a recitation of or reference to some other instrument purporting to affect title to said real property, such recitation or reference shall bind only the parties to the instrument and shall not be notice to any other person whatsoever unless the instrument mentioned or referred to in the recital is of record in the county where the real property is situated. Unless the same is so recorded, no person other than the parties to the instrument shall be required to make any inquiry or investigation concerning such recitation or reference. All such recitations or references contained in deeds and instruments recorded prior to March 28, 1927, shall, after the expiration of one year from March 28, 1927, cease to be notice unless the instrument referred to in said reservation, exception, or reference is actually recorded within said one-year period.
C.R.S. § 38-35-108