" and the port number is automatically assigned.\r\n"\r
" -r port - Specifies the remote port number. Default value is 69.\r\n"\r
" -c <retry count> - The number of times to transmit request packets and\r\n"\r
-" wait for a response. The default value is 6.\r\n"\r
+" wait for a response. The default value is 6. Set to zero\r\n"\r
+" also means to use the default value.\r\n"\r
" -t <timeout> - The number of seconds to wait for a response after\r\n"\r
" sending a request packet. Default value is 4s.\r\n"\r
" -s <block size> - Specifies the TFTP blksize option as defined in RFC 2348.\r\n"\r