diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/extension-registry/models/index.ts b/src/Umbraco.Web.UI.Client/src/packages/core/extension-registry/models/index.ts
index 7c562c37af..2b3c1e5178 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/extension-registry/models/index.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/extension-registry/models/index.ts
@@ -1,6 +1,29 @@
 import type { ManifestBase, ManifestBundle, ManifestCondition } from '@umbraco-cms/backoffice/extension-api';
 
-export type ManifestTypes = ManifestBundle<ManifestTypes> | ManifestCondition | ManifestBase;
+/**
+ * @deprecated Follow these steps to get Extension Manifest Type for v.15+ projects:
+ *
+ * Setup your `tsconfig.json` to include the extension-types as global types. Like this:
+ * ```
+	{
+		"compilerOptions": {
+			...
+			"types": [
+				"@umbraco-cms/backoffice/extension-types"
+			]
+		}
+	}
+ * ```
+ *
+ * Once done, you can use the global type `UmbExtensionManifest`.
+ *
+ * If defining your own extension types, then follow the link below for more information.
+ *
+ * [Read more on the change announcement]{https://github.com/umbraco/Announcements/issues/22}
+ */
+export type ManifestTypes = never;
+
+type UmbCoreManifestTypes = ManifestBundle<UmbCoreManifestTypes> | ManifestCondition | ManifestBase;
 
 type UnionOfProperties<T> = T extends object ? T[keyof T] : never;
 
@@ -25,7 +48,7 @@ declare global {
 	 ```
 	 */
 	interface UmbExtensionManifestMap {
-		UMB_CORE: ManifestTypes;
+		UMB_CORE: UmbCoreManifestTypes;
 	}
 
 	/**