Facebook extended permissions for users email address

Currently I am using basic facebook permissions to get the logged in users id and username. Which extended permission do I ne开发者_JAVA百科ed to use to get the logged in users email address from facebook?

email

Is the name of the permission. Here's the list of permissions: http://developers.facebook.com/docs/authentication/permissions/

    FB.login(function(response){
        if(response.status == 'connected'){
            alert('I am connected')
        }
    },{scope: 'email'});