diff --git a/changelogs/client_server/newsfragments/2141.clarification b/changelogs/client_server/newsfragments/2141.clarification
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--- a/changelogs/client_server/newsfragments/2141.clarification
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-Split account registration and management section and OpenAPI definitions.
diff --git a/changelogs/client_server/newsfragments/2141.feature b/changelogs/client_server/newsfragments/2141.feature
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+Add the OAuth 2.0 based authentication API, as per [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) and its sub-proposals.