Wiktionary
postscriptum
n. (lb en rare) (A thing which has been) write afterwards, appended.
Wikipedia
Postscriptum (album)
Postscriptum is an album by Czesław Niemen released in 1980. "Dziwny jest ten świat '79" is a new version of Niemen's best known song " Dziwny jest ten świat".
Usage examples of "postscriptum".
This desultory campaigning in Normandy was little more than a postscriptum, an afterthought, a means of filling in the interim between what was past and what was to come, and as yet unrevealed.