[mod_python] include files

I created a file index.psp and included a file called header.psp (<%@
include="header.psp" %>.
Everything works with the include file, but if I modify the header.psp
file, the index.psp file doesn't know that the header.psp file has been
modified.  If I modify the index.psp file, then it picks up the
changes.  Is there a way to get the index.psp file to recongnize that
the include file has changed?

Thanks,
Craig