diff --git a/docs/core/entity/sensor.md b/docs/core/entity/sensor.md
index e49ebeb7..ab981582 100644
--- a/docs/core/entity/sensor.md
+++ b/docs/core/entity/sensor.md
@@ -86,7 +86,7 @@ If specifying a device class, your sensor entity will need to also return the co
 | `SensorDeviceClass.VOLUME_STORAGE` | L, mL, gal, fl. oz., m³, ft³, CCF | Generic stored volume, this device class should be used for sensors representing a stored volume, for example the amount of fuel in a fuel tank.
 | `SensorDeviceClass.WATER` | L, gal, m³, ft³, CCF | Water consumption
 | `SensorDeviceClass.WEIGHT` | kg, g, mg, µg, oz, lb, st | Generic mass; `weight` is used instead of `mass` to fit with every day language.
-| `SensorDeviceClass.WIND_DIRECTION` | ° | Wind direction
+| `SensorDeviceClass.WIND_DIRECTION` | ° | Wind direction, should be set to `None` if the wind speed is 0 or too low to accurately measure the wind direction.
 | `SensorDeviceClass.WIND_SPEED` | ft/s, km/h, kn, m/s, mph | Wind speed
 
 ### Available state classes