# OpenAPI Specification Every API **MUST** be described using an API description format. The API description format used MUST be the [OpenAPI Specification (formerly known as Swagger Specification) version 2.0](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md). Every API description **MUST** be published in adidas [API design platform](./apiary.md) and it **SHOULD** be stored in version control system (Bitbucket, GitHub) in the same repository as the API implementation. ## Language The API description MUST be written in **American English**.