The A note to Strelok is a document in S.T.A.L.K.E.R.: Call of Pripyat.
A note to Strelok is a document containing a note written by Fang for Strelok and is one of three notes to each member of the group. You can find the notes in stashes around Yanov, at the Cement Factory, Quarry's Excavator or Jupiter Factory. Can be sold to Owl for 500 RU or used to obtain the A Keeper of Secrets achievement near the end of the game.