How do you provide xml comments/documentation for delegate parameters?

Question

given a delegate like

Func<string,string,string> MyFunc = (firstName,lastName) => string.Format("Given Name:{0} Surname:{1}",
                                                                            firstName,
                                                                            lastName);

How would you can you document the parameters of firstName and lastName, so they show up in intellisense (like method descriptions and parameters do)?
Example:

/// <summary>
/// My Method
/// </summary>
/// <param name="firstName">The first name.</param>
/// <param name="lastName">The last name.</param>
/// <returns></returns> 
public string MyMethod(string firstName, string lastName)
{ 
  return string.Format("Given Name:{0} Surname:{1}",firstName,lastName);
}

I want to hover over the delegate or have intellisense popup when I type and tell me the descriptions for the the delegate parameters, like it would with the above method.