> For the complete documentation index, see [llms.txt](https://adidas.gitbook.io/api-guidelines/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://adidas.gitbook.io/api-guidelines/general-guidelines/c_immutability.md).

# Immutability

After agreement with the stakeholders the contract **MUST** be published in the API registry in order to make it (that version) immutable.

The API registry acts as a central location for storing and accessing all published APIs.