diff --git a/yargs/yargs-tests.ts b/yargs/yargs-tests.ts
index 248db600be..a049af8cb3 100644
--- a/yargs/yargs-tests.ts
+++ b/yargs/yargs-tests.ts
@@ -123,6 +123,12 @@ function Argv$options() {
 		.options('f', {
 			alias: 'file',
 			default: '/etc/passwd',
+			defaultDescription: 'The /etc/passwd file',
+			group: 'files',
+			normalize: true,
+			global: false,
+			array: true,
+			nargs: 3
 		})
 		.argv
 	;
@@ -134,6 +140,37 @@ function Argv$options() {
 	;
 }
 
+function Argv$global() {
+	var argv = yargs
+		.global('foo')
+		.global(['bar', 'baz', 'fizz', 'buzz'])
+}
+
+function Argv$group() {
+	var argv = yargs
+		.group('foo', 'foogroup')
+		.group(['bing', 'bang', 'buzz'], 'onomatopoeia')
+}
+
+function Argv$env() {
+	var argv = yargs
+		.env('YARGS_PREFIX_')
+		.env()
+		.env(true);
+}
+
+function Argv$array() {
+	var argv = yargs
+		.array('foo')
+		.array(['bar', 'baz'])
+}
+
+function Argv$nargs() {
+	var argv = yargs
+		.nargs('foo', 12)
+		.nargs({'bing': 3, 'bang': 2, 'buzz': 4})
+}
+
 function Argv$choices() {
 	// example from documentation
 	var argv = yargs
@@ -241,7 +278,7 @@ function Argv$locale() {
 
 function Argv$epilogue() {
 	var argv = yargs
-  		.epilogue('for more information, find our manual at http://example.com');
+		.epilogue('for more information, find our manual at http://example.com');
 }
 
 function Argv$reset() {
diff --git a/yargs/yargs.d.ts b/yargs/yargs.d.ts
index b5700e24e1..4e6ef109ec 100644
--- a/yargs/yargs.d.ts
+++ b/yargs/yargs.d.ts
@@ -21,6 +21,9 @@ declare module "yargs" {
 			alias(shortName: string, longName: string): Argv;
 			alias(aliases: { [shortName: string]: string }): Argv;
 			alias(aliases: { [shortName: string]: string[] }): Argv;
+			
+			array(key: string): Argv;
+			array(keys: string[]): Argv;
 
 			default(key: string, value: any): Argv;
 			default(defaults: { [key: string]: any}): Argv;
@@ -90,6 +93,9 @@ declare module "yargs" {
 
 			help(): string;
 			help(option: string, description?: string): Argv;
+			
+			env(prefix?: string): Argv;
+			env(enable: boolean): Argv;
 
 			epilog(msg: string): Argv;
 			epilogue(msg: string): Argv;
@@ -102,6 +108,15 @@ declare module "yargs" {
 			showHelp(func?: (message: string) => any): Argv;
 
 			exitProcess(enabled:boolean): Argv;
+			
+			global(key: string): Argv;
+			global(keys: string[]): Argv;
+			
+			group(key: string, groupName: string): Argv;
+			group(keys: string[], groupName: string): Argv;
+			
+			nargs(key: string, count: number): Argv;
+			nargs(nargs: { [key: string]: number }): Argv;
 
 			/* Undocumented */
 
@@ -119,19 +134,27 @@ declare module "yargs" {
 
 		interface Options {
 			type?: string;
+			group?: string;
 			alias?: any;
 			demand?: any;
 			required?: any;
 			require?: any;
 			default?: any;
-			boolean?: any;
-			string?: any;
-			count?: any;
+			defaultDescription?: string;
+			boolean?: boolean;
+			string?: boolean;
+			count?: boolean;
 			describe?: any;
 			description?: any;
 			desc?: any;
 			requiresArg?: any;
 			choices?:string[];
+			global?: boolean;
+			array?: boolean;
+			config?: boolean;
+			number?: boolean;
+			normalize?: boolean;
+			nargs?: number;
 		}
 
 		type SyncCompletionFunction = (current: string, argv: any) => string[];