I've got an HDMI touchscreen for my Raspberry Pi, and the instructions say to add the following to the end of the
max_usb_current=1 hdmi_group=2 hdmi_mode=1 hdmi_mode=87 hdmi_cvt 1024 600 60 6 0 0 0
The documentation at https://www.raspberrypi.org/documentation/configuration/config-txt/video.md says that
hdmi_cvt=<width> <height> <framerate> <aspect> <margins> <interlace> <rb>
I've found examples of both on the Internet and on this site.
Which is correct?