WordNet (r) 3.0 (2006):

fine print
    n 1: the part of a contract that contains reservations and
         qualifications that are often printed in small type; "don't
         sign a contract without reading the fine print" [syn: fine
         print, small print]
    2: material printed in small type; "he needed his glasses in
       order to read the fine print" [syn: small print, fine
       print]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "fine print":
   boundary condition, catch, clause, condition, donnee,
   escalator clause, escape clause, escape hatch, given, grounds,
   joker, kicker, limiting condition, obligation, parameter,
   prerequisite, provision, provisions, proviso, requisite,
   saving clause, sine qua non, small print, specification,
   stipulation, string, terms, ultimatum, whereas