diff --git a/docs/core/entity/sensor.md b/docs/core/entity/sensor.md
index 2fdd916b..56498a46 100644
--- a/docs/core/entity/sensor.md
+++ b/docs/core/entity/sensor.md
@@ -74,6 +74,7 @@ If specifying a device class, your sensor entity will need to also return the co
 | `SensorDeviceClass.TEMPERATURE` | °C, °F, K | Temperature.
 | `SensorDeviceClass.TIMESTAMP` | | Timestamp. Requires `native_value` to return a Python `datetime.datetime` object, with time zone information, or `None`.
 | `SensorDeviceClass.VOLATILE_ORGANIC_COMPOUNDS` | µg/m³ | Concentration of volatile organic compounds
+| `SensorDeviceClass.VOLATILE_ORGANIC_COMPOUNDS_PARTS` | ppm, ppb | Ratio of volatile organic compounds
 | `SensorDeviceClass.VOLTAGE` | V, mV | Voltage
 | `SensorDeviceClass.VOLUME` | L, mL, gal, fl. oz., m³, ft³, CCF | Generic volume, this device class should be used for sensors representing a consumption, for example the amount of fuel consumed by a vehicle.
 | `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.