Documentation for typedefs not generated, C++ code

With doxygen-1.8.12, in an otherwise empty directory:

$ doxygen -g


Configuration file `Doxyfile' created.

Now edit the configuration file and enter

  doxygen Doxyfile

to generate the documentation for your project

$ cat >foo.hh

//! A documented typedef

typedef int zz;
[mrsam@octopus zz]$ doxygen
Searching for include files..

The resulting documentation in the html directory is empty. The typedef is  
not documented. The generated documentation does have a "Files" section,  
that dutifully includes the foo.hh file, showing the typedef inside it, but  
with the doxygen comment block removed.

Replacing the typedef with "class zz{};" results in the expected output.

I must be missing something obvious.

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