Changing the userAgent of NSURLConnection

Hey I am using a NSURL Connection to receive data.

[NSURLConnection sendSynchronousRequest:
//create request from url
[NSURLRequest requestWithURL:
  //create url from string
  [NSURL URLWithString:url]
] 
//request parameters
returningResponse:nil error:nil
] 

Is it possible to change the user agent string? right now it is:

AppName/AppVersion CFNetwork/459 Darwin/10.0.0.d3