prefacing

/P R EH1 F AH0 S IH0 NG/
verb
  1. 1

    To introduce or make a comment before (the main point).

    โ€œLet me preface this by saying that I don't know him that well.โ€

  2. 2

    To give a preface to.

    โ€œto preface a bookโ€

Source: https://en.wiktionary.org/wiki/preface, https://en.wiktionary.org/wiki/prefacing