What does it mean to add a ps after the text message?

Is the abbreviation of postscript (remark, which can also be interpreted as postscript and postscript).

Ps has the following meanings:

1, (signature at the end of the letter) Furthermore, there is; P.S., P.S. , PS or p.s.

2. Appendices (to books, etc.). ); postscript

Conclusion [English] (after the news broadcast).