diff --git a/bin/create_boot_disk b/bin/create_boot_disk
index f889f03..5343db3 100755
--- a/bin/create_boot_disk
+++ b/bin/create_boot_disk
@@ -12,7 +12,7 @@ printf "  1. Insert the USB boot disk into the machine to be upgraded.\n"
 printf "  2. Reboot the machine.\n"
 printf "  3. Hold down the OPTION key before the Apple logo appears.\n"
 printf "  4. Select the USB boot disk from the menu.\n"
-printf "  5. Format the machine's internal drive using Disk Utility.\n"
+printf "  5. Format the machine's internal drive using Disk Utility (choose APFS).\n"
 printf "  6. Install the new operating system.\n"
 printf "\nmacOS Reinstall:\n"
 printf "  1. Click the Apple icon from the operating system main menu.\n"