diff --git a/infrastructure_and_operations/rathouse.myco b/infrastructure_and_operations/rathouse.myco
index 2c62519..eb189d3 100644
--- a/infrastructure_and_operations/rathouse.myco
+++ b/infrastructure_and_operations/rathouse.myco
@@ -7,2 +7,31 @@ we need them for `virsh backup-begin`
+# EFI / bootloader
+
+Right now only one disk has an EFI boot entry :S please fix this?
+
+
+```
+# look at current EFI boot settings
+efibootmgr -v
+
+# lets say the currently selected boot device is the one that has to be removed.
+# in order to run grub-install on the new disk, we have to first unmount the current EFI boot partition
+umount /boot/efi
+
+mount /dev/sdb1 /boot/efi
+
+# now that the correct EFI boot partition is mounted at /boot/efi, we can run grub-install
+grub-install /dev/sdb
+
+# check our work. Note that this REPLACES the previous boot option instead of adding a new one.
+efibootmgr -v
+
+# further checking our work:
+ls /boot/efi
+ls /boot/efi/EFI
+
+# for info about how to add an additional boot entry, see
+# https://www.linuxbabe.com/command-line/how-to-use-linux-efibootmgr-examples#add-uefi-boot-entry
+```
+
# Disk Stuff