When Should I Use Response.Redirect(url, true)?

I'm redirecting to an Error page with a prettified error message in my Application_Error, in Global.asax.

At the moment it says:

Response.Redirect("Error.aspx", true);

Should that be:

Response.Redirect("Error.aspx", false); 

I'm not sure under which circumstances I should use true and which I should use false? The MSDN page says to prefer using false to avoid ThreadAbortExceptions, so when should I use true?