CD / DVD printing not possible

Now, small bad printer for the price.
Annoying only that the media CD / DVD, which according to "further technical information"
is actually possible, can not be printed. This ability was essential for my purchase decision.
Therefore only three stars.
HP Service to rapid response.
Here is an extract:
"It is with the HP Photosmart Premium C309g All not in one printer possible to directly print on a CD / DVD. Please find attached the data sheet for this model. A direct CD / DVD printing, you can only with the conduct Photosmart Premium Fax C309a . These two devices differ in some respects, such. as fax, CD / DVD printing, etc. "

Well, now everything is clear! Who is responsible for actually the specs?