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+---
+author: Erik Montnémery
+authorURL: https://github.com/emontnemery
+title: "Changes to EntityDescription data classes"
+---
+
+The `EntityDescription` classes have changed; derived `dataclasses` should now set `frozen=True` and `kw_only=True`.
+
+Setting `frozen` to `True` makes the `EntityDescription` instances immutable, which means they cannot be accidentally updated after creation.
+Setting `kw_only` to `True` ensures the order of fields can be changed in the base class without breaking users.
+
+During a deprecation period, which will end with HA Core 2025.1, it will still be possible to derive `dataclasses` not setting `frozen=True` or `kw_only=True`, but this will be logged, and the user will be asked to create an issue with the custom integration.
+
+Once HA Core 2025.1 is released, it will no longer be possible to derive `dataclasses` without setting `frozen=True` or `kw_only=True`.
+
+More details can be found in the [core PR #105211](https://github.com/home-assistant/core/pull/105211).