diff --git a/systemjs/systemjs.d.ts b/systemjs/systemjs.d.ts
index 3a71669041..2fcc2b98dc 100644
--- a/systemjs/systemjs.d.ts
+++ b/systemjs/systemjs.d.ts
@@ -27,8 +27,7 @@ declare namespace SystemJSLoader {
      * Represents a module name for System.import that must resolve to either Traceur, Babel or TypeScript.
      * When set to traceur, babel or typescript, loading will be automatically configured as far as possible.
      */
-    type Transpiler = "traceur" | "babel" | "typescript";
-
+    type Transpiler = "plugin-traceur" | "plugin-babel" | "plugin-typescript" | "traceur" | "babel" | "typescript" | boolean;
 
     type ConfigMap = PackageList<string>;
 
@@ -318,6 +317,11 @@ declare namespace SystemJSLoader {
 
 }
 
+declare var SystemJS: SystemJSLoader.System;
+
+/**
+ * @deprecated use SystemJS https://github.com/systemjs/systemjs/releases/tag/0.19.10
+ */
 declare var System: SystemJSLoader.System;
 
 declare module "systemjs" {