> ## Documentation Index
> Fetch the complete documentation index at: https://docs.t3planet.de/en/latest/llms.txt
> Use this file to discover all available pages before exploring further.

# Using Site Sets in TYPO3

If your TYPO3 project uses Site Sets, you must add TypoScript to your custom site package extension.

More details:
[https://docs.typo3.org/m/typo3/reference-typoscript/main/en-us/UsingSetting/AddTypoScriptWithExtensions.html#extension-configuration-typoscript-set-record-one](https://docs.typo3.org/m/typo3/reference-typoscript/main/en-us/UsingSetting/AddTypoScriptWithExtensions.html#extension-configuration-typoscript-set-record-one)