What does the Exclamation mark in block comment means in C++ /*! <comment>+/

Question

I have a header file in c++ , where the declaration of the functions has a block comment with an exclamation mark ! .

Example

class test{
 public:
        /*! @fn test::test()
            @brief The basic constructor, which initializes the _test handle.
        */
        test();

        /*! @fn test::upload(std::string url)
            @brief A function to execute a http POST request with the given url and image.

            @param[in] url The url we are POSTing to
            @return The response of the server
        */
        std::string upload(std::string url);
}

also it changes the color of the comment in VSCode like this

What does this exclamation mark mean in the comment?

Thanks in advance

Answer 1

These comments are for the Doxygen system that automatically generates documentation from code.