diff after update

[David Hugh-Jones]

sorry if this is an obvious question, but after doing a CVS update, how do I 
diff files?

Here's the scenario:

I am working on a file. I haven't committed any changes. I do a general cvs 
update. I notice that that file shows "M".

How do I find out what the cvs update has changed, between my old uncommitted 
version, and the new version created by the update?

David