Errata,addendum,corrigendum

Errata

Short and minor revisions to a printed or published document to correct spelling and/or

 

typing mistakes. In contrast to 'addendum,' an errata does not adds to the text and, in

 contrast to 'corrigendum,' does not subtract from it.

 http://www.businessdictionary.com/definition/errata.html#ixzz3jovufRBC

Addendum

Document or information attached or added to clarify, modify, or support the information

 in the original document or written work. In construction industry, for example, an addendum 

issued by a client during the bidding process becomes part of the contract documents when 

the  contract is awarded.

more: http://www.businessdictionary.com/definition/addendum.html#ixzz3jowMoJYM

Corrigendum

Revision of a printed or published document. A corrigendum contains corrections that are larger and more significant than those listed in an errata.

Read more: http://www.businessdictionary.com/definition/corrigendum.html#ixzz3jows1OSb