Jeff, 
Just tested, and stand by what I said.
-- Comments before Create\Alter statement

CREATE PROCEDURE sp_Bletch
 @BrandID varchar(6)
AS
-- Comments After Create\Alter statement
 SELECT
  [ID]
  ,[Name]
  ,[BrandID]
 FROM [dbo].[BrandItems]
 WHERE [BrandID] = @BrandID;
GO

Then, if you Right-Click on object, and "Script Procedure As" the external comments are not included.