I would like to suggest a small documentation improvement for INSTALL.amd64.
In the section describing manual partitioning, it might be helpful to state more explicitly that UEFI systems require an EFI System Partition (ESP) in addition to the OpenBSD partition. INSTALL.powerpc64 clearly states that two partitions are required: one OpenBSD partition for the installation and one MSDOS partition for the bootloader. Because this requirement is explicitly documented there, it is easy to understand. However, when reading INSTALL.amd64, it is possible to overlook the need for an EFI System Partition during manual partitioning. In my case, I created only an OpenBSD partition, the installation completed successfully, but the system was not bootable afterward. A short note in the manual partitioning section could help users avoid this problem, especially those who are familiar with other architectures or are performing a manual installation for the first time. In my case, I spent considerable time troubleshooting a non-bootable installation before realizing that the EFI System Partition was missing.
