A little bit more on Vref + additive:

Approach speed/wind corrections - Autothottle on.

When using AT to touchdown, position command speed to Vref + 5.
Sufficient wind and gust protection is availalable with AT because AT adjusts the approach speed upward to account for the wind gusts actually faced during the approach.

Approach Speed/Wind Corrections- AT off     manual landing

The recommended method is to add  1/2 of the reported heading component plus the full gust increment above the steady wind for the reference speed.
The maximum command speed  should not exceed the lower of Vref + 20 or landing flap placard speed minus 5
This technique provides sufficient low speed maneuver margin and reduces the possibility of flap overload. The margin for flap overload may be increase by reducing the flap setting.

Happy landing  ;D

Raymond    Boeing or nothing
KFLL    South Florida