linking #defines to classes

Hi all

New to the list, been using and loving Doxygen for quite some time now. The 
only thing I can't seem to figure out is how I associate my defines with 
classes / code. An example:

[in file datatypes.h]
#define RESPONSE_NOTHING        (1)
#define RESPONSE_SOMETHING      (2)
#define RESPONSE_SOMETHING_ELSE (3)

[in file myclass.cpp]
class test {
  public:
     int WhatResponse();
}

/*!
This function returns the response.
@returns RESPONSE_NOTHING if nothing is there, RESPONSE_SOMETHING if 
something is there, RESPONSE_SOMETHING_ELSE if something else is there.
*/
int test::WhatResponse() {
}

Now I would like to somehow "link" the defines in the first file together 
with the class description, but every time I try to even document defines, 
Doxygen tells me: "Documentation for unknown #define in file whatever.h".

Is there any way to sort of associate the class return value with the 
defines and what is the proper way to document #defines in the first place?

Thanks in advance.

Regards
Toft

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