diff --git a/docs/core/entity.md b/docs/core/entity.md
index c114af38..ed35d444 100644
--- a/docs/core/entity.md
+++ b/docs/core/entity.md
@@ -80,7 +80,7 @@ The following properties are also available on entities. However, they are for a
 | Name                            | Type    | Default | Description                                                                                                                                                                                                           |
 | ------------------------------- | ------- | ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | force_update                    | boolean | `False` | Write each update to the state machine, even if the data is the same. Example use: when you are directly reading the value from a connected sensor instead of a cache. Use with caution, will spam the state machine. |
-| icon                            | icon    | `None`  | Icon to use in the frontend. Icons start with `mdi:` plus an [identifier](https://materialdesignicons.com/). You probably don't need this since Home Assistant already provides default icons for all devices.        |
+| icon                            | icon    | `None`  | Icon to use in the frontend. Icons start with `mdi:` plus an [identifier](https://materialdesignicons.com/). `icon` and `device_class` are mutually exclusive; Do not set an `icon` if a `device_class` is present. You probably don't need this since Home Assistant already provides default icons for all devices.        |
 | entity_registry_enabled_default | boolean | `True`  | Indicate if the entity should be enabled or disabled when it is first added to the entity registry.                                                                                                                   |
 
 ## System properties