# Klaviyo segments

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Customer segment and Klaviyo rules are only available on the [Ultimate plan](https://help.fluorescent.co/section-studio/get-started/choose-subscription-plan).
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Use Klaviyo customer segments for advanced audience targeting.

## Add customer segment rule

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Before creating your first Customer segment or Shopify markets rule, you will need to [set up an API access key](#store-api-key).
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#### Steps

1. Go to **Audiences** page and click **Create new audience**. 
2. Enter a name for your audience. You can change the name later.
3. Select the **Customer segments** rule type.
4. Select 1 or more customer segments from the list.
5. Click **Save**.
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## Enter Klaviyo API token

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To authorize the use of your Klaviyo customer segments, you will need to enter your Klaviyo API token when you create your first Klaviyo rule.