to your knowledge

to (one's) knowledge

Said of that which one knows or understands. A: "Is Janet coming in today?" B: "Not to my knowledge." To my knowledge, Jack is working a different shift these days. But Jill makes the schedule, so she would know for sure.
See also: knowledge

to your ˈknowledge

from the information you have, although you may not know everything: ‘Are they divorced?’ ‘Not to my knowledge.’
See also: knowledge