# List source

> **Pre-requisites:** To use the list source, you need to create the custom list. \
> See more: [Custom lists](/features/audiences/custom-lists.md)

## Enablement

1. Go to the Flows module.
2. Drag and drop the Custom list block into your flow and click on the ‘Edit’ icon.
3. Choose a custom list from the drop down.
4. Specify entrance. Available options: 

* ***Once*** - the audience enters the flow only once. 
* ***Repeated*** - the audience enters the flow on a cadence.

 5\. Specify frequency of *Repeated* entrance. Available options: 

* *Hourly* 
* *Daily*
* *Weekly*
* *Monthly*

6\. Specify re-entrancy of *Repeated* entrance. Available options: 

* ***Can re-enter** is checked* - Addresses are sent through the flow again if they are still present when the flow repeats.
* ***Can re-enter** is not checked* - Addresses cannot be sent more than once through the flow.

7\. Save the block.

![](/files/uKVTfhlDo7IdqXOd3PYQ)![](/files/uIh8UqAnvN9ythqU12lL)


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