emendation

n. emendation, correction, improvement

(n.)
The act of altering for the better, or correcting what is erroneous or faulty; correction; improvement.
  

(n.)
Alteration by editorial criticism, as of a text so as to give a better reading; removal of errors or corruptions from a document; as, the book might be improved by judicious emendations.
  

Noun
1. a correction by emending; a correction resulting from critical editing
(hypernym) correction, rectification