# How to Customize Your Error Notification Flow?

When a flow fails, Fastn can automatically forward errors to a **notification flow**. By default, this is `fastnErrorNotification`. You can customize it to format error messages, enrich them with extra context, or forward alerts to external systems.

* In your flow, go to the **right-hand sidebar → Settings → Configuration**.

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* Under **Error Notification**, toggle **Enable Error Notification**.

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* Open the **fastnErrorNotification** flow.

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* This flow starts with an **On API Request** trigger.
* Inside this flow, you can:
  * Map values from the incoming error.
  * Alter the error message.
  * Optionally, add any other steps as needed.

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* Save your changes.

**With this setup, you have control over how error messages are handled and displayed for your flow.**