While the support for /** */ doxygen comments works well in 6.9 to pop up documentation during code completion, a number of projects use single or multiple /// lines instead.  This latter syntax is fully supported by Doxygen itself, so it would be nice for NetBeans to have support for it as well.

E.g. instead of:
/**
 * Function description.
 * @param p1
 */
void func(int p1);

It reads:
/// Function description.
/// @param p1
void func(int p1);