diff --git a/systemjs/index.d.ts b/systemjs/index.d.ts
index 428e303442..4dc975ced7 100644
--- a/systemjs/index.d.ts
+++ b/systemjs/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for SystemJS 0.19.29
+// Type definitions for SystemJS 0.20.5
 // Project: https://github.com/systemjs/systemjs
 // Definitions by: Ludovic HENIN <https://github.com/ludohenin/>, Nathan Walker <https://github.com/NathanWalker/>, Giedrius Grabauskas <https://github.com/GiedriusGrabauskas>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -257,7 +257,7 @@ declare namespace SystemJSLoader {
         /**
          * This represents the System base class, which can be extended or reinstantiated to create a custom System instance.
          */
-        constructor: new () => System;
+        constructor: new() => System;
 
         /**
          * Deletes a module from the registry by normalized name.
@@ -270,6 +270,11 @@ declare namespace SystemJSLoader {
         get(moduleName: string): any;
         get<TModule>(moduleName: string): TModule;
 
+        /**
+         * Returns a clone of the internal SystemJS configuration in use.
+         */
+        getConfig(): Config
+
         /**
          * Returns whether a given module exists in the registry by normalized module name.
          */
@@ -282,6 +287,12 @@ declare namespace SystemJSLoader {
         import(moduleName: string, normalizedParentName?: string): Promise<any>;
         import<TModule>(moduleName: string, normalizedParentName?: string): Promise<TModule>;
 
+        /**
+         * Given any object, returns true if the object is either a SystemJS module or native JavaScript module object, and false otherwise.
+         * Useful for interop scenarios.
+         */
+        isModule(object: any): boolean;
+
         /**
          * Given a plain JavaScript object, return an equivalent Module object.
          * Useful when writing a custom instantiate hook or using System.set.
@@ -320,7 +331,6 @@ declare namespace SystemJSLoader {
          */
         loads: PackageList<any>;
     }
-
 }
 
 declare var SystemJS: SystemJSLoader.System;