Предупреждение о кислороде: игнорирование неизвестного тега

Использование Doxygen для генерации документации. Получение «Предупреждение: игнорирование неизвестного тега» ошибки, и я не могу понять, почему.

Минимальный, полный и проверяемый пример:

/** This is a test */
#include <iostream>

/** \fn foo */
int foo() {
return 0;
}

int main() {
std::cout << "hello world" << std::endl;
return 0;
}

Ошибки:

[53]: doxygen .\myTest.cpp
Warning: ignoring unknown tag `This' at line 1, file .\myTest.cpp
Warning: ignoring unknown tag `is' at line 1, file .\myTest.cpp
Warning: ignoring unknown tag `a' at line 1, file .\myTest.cpp
Warning: ignoring unknown tag `test' at line 1, file .\myTest.cpp
Warning: ignoring unknown tag `fn' at line 4, file .\myTest.cpp
Warning: ignoring unknown tag `foo' at line 4, file .\myTest.cpp
Warning: ignoring unknown tag `int' at line 5, file .\myTest.cpp
Warning: ignoring unknown tag `foo' at line 5, file .\myTest.cpp
Warning: ignoring unknown tag `return' at line 6, file .\myTest.cpp
Warning: ignoring unknown tag `0' at line 6, file .\myTest.cpp
Warning: ignoring unknown tag `int' at line 9, file .\myTest.cpp
Warning: ignoring unknown tag `main' at line 9, file .\myTest.cpp
Warning: ignoring unknown tag `std' at line 10, file .\myTest.cpp
Warning: ignoring unknown tag `cout' at line 10, file .\myTest.cpp
Warning: ignoring unknown tag `hello' at line 10, file .\myTest.cpp
Warning: ignoring unknown tag `world' at line 10, file .\myTest.cpp
Warning: ignoring unknown tag `std' at line 10, file .\myTest.cpp
Warning: ignoring unknown tag `endl' at line 10, file .\myTest.cpp
Warning: ignoring unknown tag `return' at line 11, file .\myTest.cpp
Warning: ignoring unknown tag `0' at line 11, file .\myTest.cpp
Searching for include files...
Searching for example files...
Searching for images...
Searching for dot files...
Searching for files to exclude
Searching for files to process...
...other stuff...

Спасибо, С уважением, Кит: ^)