Definitions for "Supplementary"
As used in NFPA 72, National Fire Alarm Code, supplementary refers to equipment or operations not required by NFPA 72, National Fire Alarm Code, and designated as such by the authority having jurisdiction.
functioning in a subsidiary or supporting capacity; "the main library and its auxiliary branches"
Added to supply what is wanted; additional; being, or serving as, a supplement; as, a supplemental law; a supplementary sheet or volume.
added to complete or make up a deficiency; "produced supplementary volumes"; "additional reading"
Keywords:  angles, sum, two
two angles having a sum of 180