> ## Documentation Index
> Fetch the complete documentation index at: https://help.flowforth.co/llms.txt
> Use this file to discover all available pages before exploring further.

# List Triggers

> Start an automation when a person is added to or removed from a Planning Center list.

List triggers run an automation based on changes to a **Planning Center list**. They're the most common way to build welcome series, onboarding flows, and follow-ups.

There are two list triggers:

* **When a person is added to a list** — enrolls someone the moment they join the list
* **When a person is removed from a list** — enrolls someone when they leave the list

***

## Setting It Up

1. Choose **When a person is added to a list** or **When a person is removed from a list** as your trigger.
2. Select the **Planning Center list** to monitor.
3. Select the **email category** the automation's emails will be sent under.

Once the automation is active, Flowforth watches that list and enrolls people automatically as they're added or removed.

<Note>
  People are only enrolled when they meet the trigger **while the automation is active**. Anyone who joined or left the list before you turned it on is not added retroactively.
</Note>

***

## Auto-Refreshing Lists and the Start Offset

Planning Center lists that auto-refresh do so at **2:00 AM**. If your first step sends an email right away, people could receive it in the middle of the night.

For list triggers, the builder asks **"Is this list automatically refreshed?"** and lets you set an **Offset start by** value in **hours**. Setting an offset delays the start of the automation for each newly enrolled person by that many hours.

* We recommend an offset of **at least 6 hours** so an automation that would otherwise begin at 2:00 AM starts at a friendlier 8:00 AM instead.
* Alternatively (or in addition), you can begin your automation with a [Wait step](/automations/builder/wait) before the first email.

<Tip>
  Not sure whether your list auto-refreshes? You can check and manage a list's refresh schedule from its list details page.
</Tip>