diff --git a/docs/core/entity/sensor.md b/docs/core/entity/sensor.md
index 61270150..bc8bf7fa 100644
--- a/docs/core/entity/sensor.md
+++ b/docs/core/entity/sensor.md
@@ -43,7 +43,7 @@ If specifying a device class, your sensor entity will need to also return the co
 | `SensorDeviceClass.DATA_SIZE` | bit, kbit, Mbit, Gbit, B, kB, MB, GB, TB, PB, EB, ZB, YB, KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB | Data size
 | `SensorDeviceClass.DATE` | | Date. Requires `native_value` to be a Python `datetime.date` object, or `None`.
 | `SensorDeviceClass.DISTANCE` | km, m, cm, mm, mi, yd, in | Generic distance
-| `SensorDeviceClass.DURATION` | d, h, min, s | Time period. Should not update only due to time passing. The device or service needs to give a new data point to update.
+| `SensorDeviceClass.DURATION` | d, h, min, s, ms | Time period. Should not update only due to time passing. The device or service needs to give a new data point to update.
 | `SensorDeviceClass.ENERGY` | Wh, kWh, MWh, MJ, GJ | Energy, this device class should used for sensors representing energy consumption, for example an electricity meter. Represents _power_ over _time_. Not to be confused with `power`.
 | `SensorDeviceClass.ENERGY_STORAGE` | Wh, kWh, MWh, MJ, GJ | Stored energy, this device class should be used for sensors representing stored energy, for example the amount of electric energy currently stored in a battery or the capacity of a battery. Represents _power_ over _time_. Not to be confused with `power`.
 | `SensorDeviceClass.ENUM` | | The sensor has a limited set of (non-numeric) states. The `options` property must be set to a list of possible states when using this device class.