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Entity Framework UPDATE operation. Why is a child entry first recorded?

Background: I have a connection from 1 to 0..1 between User and UserSettings .. p>

The important part of the model is as follows:

public class User
{
   public int UserId { get; set; }
   public string Name { get; set; }
   public UserSettings Settings { get; set; }
}

public class UserSettings
{
   public int UserId { get; set; } // PK/FK
   public sting SpecialField { get; set; }
}

When I do INSERT :

var user = new User { Settings = new UserSettings { SpecialField = "Foo" }};
ctx.Users.Add(user);
ctx.SaveChanges();

Everything is cool, when I check the trace, User is added first , then UserSettings - as you would expect, since UserSettings requires IDENTITY from the User .

But when I UPDATE that "SpecialField":

var user = ctx.Users.Include("Settings").Single();
user.Name = "Joe";
user.Settings.SpecialField = "Bar";
ctx.SaveChanges();

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