# Extend configuration

In the previous post, I explained how to create a child theme. You can add another field to the `theme.json` file supplied:

{% hint style="info" %}
You can find the possible configuration fields in the official Shopware developer documentation.

**Tip:**\
Just look in the main theme, where you can use existing fields as a guide.
{% endhint %}

### Example of an additional color field

In the following example, I add a color field to the configuration, which you can then use from your administration. The color field is also compiled as CSS as an example in one of the following steps:

{% content-ref url="individual-scss" %}
[individual-scss](https://docs.rh-webdesign.com/shopware-theme/en/for-developers/child-theme/individual-scss)
{% endcontent-ref %}

Your `theme.json` should include this code with an additional color field:

{% @github-files/github-code-block url="<https://github.com/rhwebdesign/RHWebChildThemeTemplate/blob/master/src/Examples/_exampleColorField.json>" %}

{% hint style="info" %}
You can now use the SCSS variable **$rhweb-custom-color-field** in your code.
{% endhint %}

You can find more information on theme configuration in the [official Shopware documentation](https://developer.shopware.com/docs/guides/plugins/themes/theme-configuration.html#structure-of-theme-configuration).