fine print

1. The portion of a document, especially a contract, that contains qualifications or restrictions in small type or obscure language.
2. Something presented in a deliberately ambiguous or obscure manner.

Non-standard terms included in a contract, often in a small font.

Investopedia Says:
Restrictions or disadvantageous terms are often found in the fine print.

Related Links:
Find out what could be hidden in this often-overlooked part of the financial statements. Footnotes: Start Reading The Fine Print

noun

A small, often specialized element of a whole: detail, item, particular, technicality. See group.

The noun has 2 meanings:

Meaning #1: the part of a contract that contains reservations and qualifications printed in small type
  Synonym: small print

Meaning #2: material printed in small type
  Synonym: small print