diff --git a/requirejs/require-2.1.d.ts b/requirejs/require-2.1.d.ts
index bae2ad8372..1d6934041b 100644
--- a/requirejs/require-2.1.d.ts
+++ b/requirejs/require-2.1.d.ts
@@ -132,8 +132,8 @@ interface Require {
 	// Start the main app logic.
 	// Callback is optional.
 	// Can alternatively use deps and callback.
-	(modules: string[]): void;
-	(modules: string[], ready: (...modules: any[]) => void): void;
+	(module: string): any;
+	(modules: string[], ready?: (...modules: any[]) => void, errorCallback?: (err : RequireError) => void): void;
 
 	// Generate URLs from require module
 	toUrl(module: string): string;
@@ -148,6 +148,15 @@ interface Require {
 	onResourceLoad(context: Object, map: RequireMap, depArray: RequireMap[]): void;
 }
 
+interface RequireError
+{
+	requireType: string;
+	requireModules: string[];
+	originalError?: string;
+	contextName? : string;
+	requireMap?: any;
+}
+
 interface RequireDefine {
 
 	/**
@@ -194,4 +203,4 @@ interface RequireDefine {
 
 // Ambient declarations for 'require' and 'define'
 var require: Require;
-var define: RequireDefine;
\ No newline at end of file
+var define: RequireDefine;