diff --git a/.changeset/stale-frogs-agree.md b/.changeset/stale-frogs-agree.md
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+---
+'@backstage/frontend-app-api': patch
+---
+
+Updates to match the introduction of `ExtensionDefinition` and new extension ID naming patterns.
diff --git a/.changeset/ten-snakes-wait.md b/.changeset/ten-snakes-wait.md
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+---
+'@backstage/frontend-plugin-api': minor
+---
+
+**BREAKING**: This version changes how extensions are created and how their IDs are determined. The `createExtension` function now accepts `kind`, `namespace` and `name` instead of `id`. All of the new options are optional, and are used to construct the final extension ID. By convention extension creators should set the `kind` to match their own name, for example `createNavItemExtension` sets the kind `nav-item`.
+
+The `createExtension` function as well as all extension creators now also return an `ExtensionDefinition` rather than an `Extension`, which in turn needs to be passed to `createPlugin` or `createExtensionOverrides` to be used.