Triple-slash comments on the namespace itself is currently not supported. It would be great to add this, so that <summary> and <remarks> tags works, and would be presented on the API Documentation page, similar to old style MSDN pages like: http://msdn.microsoft.com/en-us/library/system.data.aspx.

Example:

/// <summary>Does not show up in .yml or .html output, but</summary>
/// <remarks>would be really nice if it did.</remarks>
namespace Boogie.On
{
}