R devel - Nov 2011 - R CMD check: "Undocumented class" for class created with setOldClass()

Hi all,

in a package, I register two S3 classes (namely ff_vector and ffdf) by 
calling setOldClass() in order to use them as slots in S4 classes. Now, 
R CMD check gives me the warning:

Undocumented S4 classes:
  'ff_vector' 'ffdf'

Is there a way to avoid having to document classes I did not write? Or 
is this intended behaviour?

Best regards,

Andreas

-- 
Andreas Borg
Abteilung Medizinische Informatik

Universit?tsmedizin der Johannes Gutenberg-Universit?t Mainz
Institut f?r Med. Biometrie, Epidemiologie und Informatik (IMBEI)
Obere Zahlbacher Stra?e 69, 55131 Mainz

Tel:  +49 (0) 6131 17-5062

E-Mail: andreas.borg at uni-mainz.de