“Addendum (noun) Something added or to be added, as a subsequent comment, note, or insertion; appended supplement. Plural: addenda.
‘The public is probably not deceived about the quality of most of these books. If the question of quality is brought up, the answer is likely to be: not, they are not ‘literature.’ But there is an unexpressed addendum: and perhaps they are all the better for not being imaginative, for not being literature—they are not literature, they are reality, and in a time like this what we need is reality in large doses.’ Lionel Trilling, The Liberal Imagination.”
Excerpted from: Grambs, David. The Random House Dictionary for Writers and Readers. New York: Random House, 1990.