Nikon D810 - Manual (Page 154)

130
Exposure compensation is used to alter exposure from the value
suggested by the camera, making pictures brighter or darker. It
is most effective when used with center-weighted or spot
metering (0 114). Choose from values between –5 EV
(underexposure) and +5 EV (overexposure) in increments of
1 /
3
EV. In general, positive values make the subject brighter while
negative values make it darker.
Exposure Compensation
–1 EV No exposure
compensation
+1 EV