A.T. Robertson Commentary Mark 14:9

"And verily I say unto you, Wheresoever the gospel shall be preached throughout the whole world, that also which this woman hath done shall be spoken of for a memorial of her." — Mark 14:9 (ASV)

For a memorial of her (εις μνημοσυνον αυτης). So in Mt 26:13. There are many mausoleums that crumble to decay. But this monument to Jesus fills the whole world still with its fragrance. What a hint there is here for those who wish to leave permanent memorials.