# Set Up Feature Flags | Sentry for Flutter

## [Prerequisites](https://docs.sentry.io/platforms/dart/guides/flutter/feature-flags.md#prerequisites)

* [Sentry SDK](https://docs.sentry.io/platforms/dart.md#configure) version `9.0.0`.

## [Enable Evaluation Tracking](https://docs.sentry.io/platforms/dart/guides/flutter/feature-flags.md#enable-evaluation-tracking)

If you use a third-party SDK to evaluate feature flags, you can enable Sentry to track those evaluations. Integrations are provider specific, and documentation for supported SDKs is listed below:

* [Firebase Remote Config](https://docs.sentry.io/platforms/dart/configuration/integrations/firebase-remote-config.md)

### [Manual Usage](https://docs.sentry.io/platforms/dart/guides/flutter/feature-flags.md#manual-usage)

Call `Sentry.addFeatureFlag` to track feature flag evaluations:

```dart
Sentry.addFeatureFlag("feature_flag_a", true);
```

Calling this function multiple times with the same flag name will override the previous value.