Dynamic playlist based on smart playlist

[Mark Fraser]

I've got a question about smart playlists and dynamic playlists created from 
them.

If I create my own smart playlist containing a few rules of what tracks to 
exclude and then create a dynamic playlist, if I later add more tracks to my 
collection will the smart and thus dynamic playlist automatically update?

Or would I have to load the smart playlist every time I add more tracks?

Hope that makes sense!