== Precice Meaning of the Latin == 

 Post scriptum was listed in the article as possible meaning "after the writing" or "the writing which comes afterwards." However, according to proper Latin, only the former meaning would be possible. 

 Post scriptum consists of one accusative-requiring preposition (translated "after") and its object. If the writer meant to confer through the Latin the meaning of "the writing which comes afterward," the Latin would, at a minimum, contain the adverb postea (and probably should account for the adjective phrase). 

 So, I am removing the alternative explanation.