# Property Metadata for the ChangeTrackingService

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

## Control properties changes tracking

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