# Step 5: Enable dependency discovery (optional)
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Dependency discovery automatically identifies the AWS services, internal endpoints, and third-party endpoints that your service calls. It uses DNS query log analysis with a 35-day look-back window and continuous polling to identify dependencies you may not know about, including unexpected cross-Region calls or critical third-party dependencies.

Dependency discovery is an optional add-on. To enable it, navigate to your service in the console and choose **Enable dependency discovery**. Once enabled, the next generation of Resilience Hub begins discovering dependencies and surfaces them on the **Dependencies** tab of your service.

For more information, see [Dependency discovery](next-gen-dependency-discovery.md).