# 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.radicalframework.com/memento/change-tracking-service/memento-metadata.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.