In both *GRUB* and *SYSLINUX*, the keyboard layout of the Boot Menu is set to English (US).
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[[!img install/inc/screenshots/syslinux.pnglink="no" class="screenshot" alt="Black screen ('SYSLINUX') with Tails logo and 2 options: 'Tails' and 'Tails (Troubleshooting Mode)'."]]
[[!img install/inc/screenshots/syslinux.png class="screenshot" alt="Black screen ('SYSLINUX') with Tails logo and 2 options: 'Tails' and 'Tails (Troubleshooting Mode)'."]]
To add a boot option, navigate with the arrows of the keyboard to the end of the line that starts with `linux`. Type the boot option that you want to add. The line is most likely wrapped and displayed on several lines but it is a single configuration line.