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 bd4ccfc45e..8b7ea3fd93 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
@@ -59,6 +59,7 @@ export interface Api extends LegacyModuleApiExtension, LegacyCustomisationsApiEx
 
 // @alpha
 export interface BuiltinsApi {
+    renderNotificationDecoration(roomId: string): React.ReactNode;
     renderRoomAvatar(roomId: string, size?: string): React.ReactNode;
     renderRoomView(roomId: string, props?: RoomViewProps): React.ReactNode;
 }