diff --git a/packages/element-web-module-api/element-web-module-api.api.md b/packages/element-web-module-api/element-web-module-api.api.md
index 56fa2bb06b..9b2234e377 100644
--- a/packages/element-web-module-api/element-web-module-api.api.md
+++ b/packages/element-web-module-api/element-web-module-api.api.md
@@ -35,15 +35,26 @@ export interface AliasCustomisations {
 //
 // @public
 export interface Api extends LegacyModuleApiExtension, LegacyCustomisationsApiExtension, DialogApiExtension, AccountAuthApiExtension, ProfileApiExtension {
+    // @alpha
+    readonly builtins: BuiltinsApi;
     readonly config: ConfigApi;
     createRoot(element: Element): Root;
     // @alpha
     readonly customComponents: CustomComponentsApi;
+    // @alpha
+    readonly extras: ExtrasApi;
     readonly i18n: I18nApi;
+    // Warning: (ae-incompatible-release-tags) The symbol "navigation" is marked as @public, but its signature references "NavigationApi" which is marked as @alpha
     readonly navigation: NavigationApi;
     readonly rootNode: HTMLElement;
 }
 
+// @alpha
+export interface BuiltinsApi {
+    // (undocumented)
+    getRoomViewComponent(): React.ComponentType<RoomViewProps>;
+}
+
 // @alpha @deprecated (undocumented)
 export interface ChatExportCustomisations<ExportFormat, ExportType> {
     getForceChatExportParameters(): {
@@ -140,6 +151,12 @@ export interface DirectoryCustomisations {
     requireCanonicalAliasAccessToPublish?(): boolean;
 }
 
+// @alpha
+export interface ExtrasApi {
+    // (undocumented)
+    addSpacePanelItem(renderer: SpacePanelItemRenderFunction): void;
+}
+
 // @public
 export interface I18nApi {
     get language(): string;
@@ -186,6 +203,9 @@ export interface LifecycleCustomisations {
     onLoggedOutAndStorageCleared?(): void;
 }
 
+// @alpha
+export type LocationRenderFunction = () => JSX.Element;
+
 // @alpha
 export interface MatrixEvent {
     content: Record<string, unknown>;
@@ -270,8 +290,10 @@ export class ModuleLoader {
     start(): Promise<void>;
 }
 
-// @public
+// @alpha
 export interface NavigationApi {
+    // (undocumented)
+    registerLocationRenderer(path: string, renderer: LocationRenderFunction): void;
     toMatrixToLink(link: string, join?: boolean): Promise<void>;
 }
 
@@ -297,9 +319,20 @@ export interface RoomListCustomisations<Room> {
     isRoomVisible?(room: Room): boolean;
 }
 
+// @alpha
+export interface RoomViewProps {
+    // (undocumented)
+    roomId?: string;
+}
+
 // @alpha @deprecated (undocumented)
 export type RuntimeModuleConstructor = new (api: ModuleApi) => RuntimeModule;
 
+// Warning: (ae-forgotten-export) The symbol "SpacePanelItemProps" needs to be exported by the entry point index.d.ts
+//
+// @alpha
+export type SpacePanelItemRenderFunction = (props: SpacePanelItemProps) => JSX.Element;
+
 // @public
 export type Translations = Record<string, {
     [ietfLanguageTag: string]: string;
diff --git a/packages/element-web-module-api/src/api/builtins.ts b/packages/element-web-module-api/src/api/builtins.ts
index 31280366e0..701ed1f684 100644
--- a/packages/element-web-module-api/src/api/builtins.ts
+++ b/packages/element-web-module-api/src/api/builtins.ts
@@ -5,6 +5,10 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
+/**
+ * The props that must be passed to a RoomView component.
+ * @alpha Subject to change.
+ */
 export interface RoomViewProps {
     roomId?: string;
 }
@@ -13,6 +17,7 @@ export interface RoomViewProps {
  * Exposes components that are part of Element Web to allow modules to render them
  * as part of their custom components (because they can't import the components from
  * Element Web since it would cause a dependency cycle)
+ * @alpha
  */
 export interface BuiltinsApi {
     getRoomViewComponent(): React.ComponentType<RoomViewProps>;
diff --git a/packages/element-web-module-api/src/api/extras.ts b/packages/element-web-module-api/src/api/extras.ts
index c4ad313b5f..da29a61ac3 100644
--- a/packages/element-web-module-api/src/api/extras.ts
+++ b/packages/element-web-module-api/src/api/extras.ts
@@ -11,8 +11,16 @@ interface SpacePanelItemProps {
     isPanelCollapsed: boolean;
 }
 
+/**
+ * The type of the function used to render a space panel item.
+ * @alpha
+ */
 export type SpacePanelItemRenderFunction = (props: SpacePanelItemProps) => JSX.Element;
 
+/**
+ * API for inserting extra UI into Element Web.
+ * @alpha Subject to change.
+ */
 export interface ExtrasApi {
     addSpacePanelItem(renderer: SpacePanelItemRenderFunction): void;
 }
diff --git a/packages/element-web-module-api/src/api/index.ts b/packages/element-web-module-api/src/api/index.ts
index 9ad4fc614f..dacc7501be 100644
--- a/packages/element-web-module-api/src/api/index.ts
+++ b/packages/element-web-module-api/src/api/index.ts
@@ -105,6 +105,10 @@ export interface Api
      */
     readonly customComponents: CustomComponentsApi;
 
+    /**
+     * Allows modules to render components that are part of Element Web.
+     * @alpha
+     */
     readonly builtins: BuiltinsApi;
 
     /**
@@ -113,6 +117,10 @@ export interface Api
      */
     readonly navigation: NavigationApi;
 
+    /**
+     * Allows modules to insert extra UI into Element Web.
+     * @alpha
+     */
     readonly extras: ExtrasApi;
 
     /**
diff --git a/packages/element-web-module-api/src/api/navigation.ts b/packages/element-web-module-api/src/api/navigation.ts
index 063b683445..e5bef01287 100644
--- a/packages/element-web-module-api/src/api/navigation.ts
+++ b/packages/element-web-module-api/src/api/navigation.ts
@@ -7,11 +7,16 @@ Please see LICENSE files in the repository root for full details.
 
 import { JSX } from "react";
 
+/**
+ * A function called to render a component when a user navigates to the corresponding
+ * location. Currently renders alongside just the SpacePanel.
+ * @alpha
+ */
 export type LocationRenderFunction = () => JSX.Element;
 
 /**
  * API methods to navigate the application.
- * @public
+ * @alpha
  */
 export interface NavigationApi {
     /**