How do I get custom intellisense to work with compiled dll?

Hi
I have been using the <summary> tags etc to add references to my classes
etc. When I use this within the project the comments come through in
intellisense and also in the object browser.

When I reference the resulting dll from another project however none of the
comments come up in intellisense or the object browser. I have set the
property in the project properties to compile it to an xml file - which it
does and the file contents look correct. Am I missing something in tying
the two together? They are in the same folder when built (or referenced).

Thanks in advance
Mark