diff --git a/_format/1.2/index.md b/_format/1.2/index.md
index b34ade3ec..8288fffdd 100644
--- a/_format/1.2/index.md
+++ b/_format/1.2/index.md
@@ -17,6 +17,14 @@ JSON:API requires use of the JSON:API media type
([`application/vnd.api+json`](http://www.iana.org/assignments/media-types/application/vnd.api+json))
for exchanging data.
+> For additional needs of HTTP APIs, like authentication, documentation, file
+> uploads, and more, JSON:API can and should be combined with additional
+> standards such as [OAuth 2.0](https://datatracker.ietf.org/doc/html/rfc6749)
+> for authorization and [Open API](https://spec.openapis.org/oas/latest.html)
+> for documentation. It is allowed for a server supporting JSON:API to also
+> support other API standards on the same or other endpoints, such as
+> [OData](https://www.odata.org/) or [GraphQL](https://graphql.org/).
+
## Semantics
All document members, query parameters, and processing rules defined by
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