matter - written works (especially in books or magazines); "he always took some reading matter with him on the plane"

back matter, end matter - written matter following the main text of a book

appendix - supplementary material that is collected and appended at the back of a book

continuation, sequel - a part added to a book or play that continues and extends it

increment, increase - the amount by which something increases; "they proposed an increase of 15 percent in the fare"

auto accessory - an accessory for an automobile

constituent, element, component - an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system"

computer accessory - an accessory for a computer; "when you add in all the computer accessories you are going to need the computer gets pretty expensive"

fitting - a small and often standardized accessory to a larger system

trimmings, fixings - the accessories that normally accompany (something or some activity); "an elaborate formal dinner with all the fixings"; "he bought a Christmas tree and trimmings to decorate it"

add - make an addition (to); join or combine or unite with others; increase the quality, quantity, zise or scope of; "We added two students to that dorm room"; "She added a personal note to her letter"; "Add insult to injury"; "Add some extra plates to the dinner table"

vitaminise, vitaminize - add vitamins as a supplement; "vitaminized processed foods"

eke out, fill out - supplement what is thought to be deficient; "He eked out his meager pay by giving private lessons"; "Braque eked out his collages with charcoal"

leverage - supplement with leverage; "leverage the money that is already available"

supplement - serve as a supplement to; "Vitamins supplemented his meager diet"

supplement - add as a supplement to what seems insufficient; "supplement your diet"

constitute, make up, comprise, be, represent - form or compose; "This money is my only income"; "The stone wall was the backdrop for the performance"; "These constitute my entire belonging"; "The children made up the chorus"; "This sum represents my entire income for a year"; "These few men comprise his entire army"

attach - cause to be attached

annex - attach to