> For the complete documentation index, see [llms.txt](https://docs.radicalframework.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.radicalframework.com/release-1/memento/change-tracking-service/memento-metadata.md).

# Property Metadata for the ChangeTrackingService

A `MementoEntity`, being a Radical `Entity`, will benefit of the [Property System](https://github.com/RadicalFx/documentation/tree/3311fbb6d65f98ece74ce84f7fde9dec2a25a7ee/entities/property-system.md) and of the properties metadata the the property system adds. A `MementoEntity` enriches the property system basic metadata adding some behaviors directly related to the memento services.

`DisableChangesTracking()` and `EnableChangesTracking()` change tracking is enabled by default on all properties, Radical properties, of a tracked entity, it is possible to control on which properties disable or enable the tracking system via the property metadata or decorating the property with the `MementoPropertyMetadataAttribute` and setting the `TrackChanges` value.