Emendation

n.	1.	The act of altering for the better, or correcting what is erroneous or faulty; correction; improvement.
	2.	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.

emendation - a correction by emending; a correction resulting from critical editing

correction, rectification