# Custom structures

## Create the file

To create a custom structures folder, the first command to run is :

```
/scustom structure <foldername>
```

This generates a folder located at  `/plugins/Stratos/customization/structure/`.&#x20;

## Set up structures

To set up trees, use [Stratos Tool](/stratos/customization/stratos-tool.md) and put the `xml` files into the created folder `<foldername>`.

{% hint style="danger" %}
Every structure has to be under 48x48 blocks to fit three chunks
{% endhint %}

## Set the structures in your custom biome

Go into the `<biomename>.yml` file you want to add the cave and modify the **structure** property and set it to `<foldername>`.


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