Menu option doesn't show under appearance

Hi –
I am new to building wordpress theme. I am building one right now. I just added two menus to my theme using the following code in the function.php file:

add_theme_support( 'menus' );
	add_action('init', 'register_my_menus');
	function register_my_menus(){
		register_nav_menus(
			array(
				'header-menu' => 'Header Menu',
				'side-bar-menu' => 'Side Bar Menu'
			)
		);
	}

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Then I go to the admin page, but under Appearance, the menus suboption doesn’t appear. Any help will be appreciated.

Thanks.