Confusion regarding void

[Pratyush Jayachandran]

I'm trying to document a project written in C.

I couldn't find the rules for documenting functions that return void and/or
have no parameters.

By extension of other rules, should it be
@return void
and
@param void

Omitting them will result in the document showing just blank.

Is it left on the user to decide? What is the industry standard?

Regards,
Pratyush

[Pratyush Jayachandran]

I forgot to mention. The way I am documenting right now is by writing the name of the parameter or return type and then the description.
Example:

/**
 * @ingroup ntp
 * @brief Receives and processes the NTP packet. 
 * @param length Length of the received NTP packet
 * @return void
 */
void NTP_Handler(int16_t length);