追伸

1. Origins, structure, and basic meaning

• Structure: 追伸 (ついしん) is a noun for a postscript added at the end after the main body of a letter.
• Basic usage: It describes adding a final note or referring to information written in that postscript.
  • 手紙の最後に追伸を書き加えた。 — I added a postscript at the end of the letter.
  • 追伸には旅行の日程が短く記されていた。 — The postscript briefly stated the travel schedule.

2. Common pitfalls and similar expressions

• Additional note after the main text
  • 追伸 is supplementary content after the main letter and closing, not an opening greeting or the title of the body.