diff --git a/Debian-Buster-Encrypted-Root-on-ZFS.md b/Debian-Buster-Encrypted-Root-on-ZFS.md
index 986b8db..bc81f8f 100644
--- a/Debian-Buster-Encrypted-Root-on-ZFS.md
+++ b/Debian-Buster-Encrypted-Root-on-ZFS.md
@@ -362,6 +362,8 @@ Install GRUB to the disk(s), not the partition(s).
 
 * The `-s 1` for `mkdosfs` is only necessary for drives which present 4 KiB logical sectors (“4Kn” drives) to meet the minimum cluster size (given the partition size of 512 MiB) for FAT32. It also works fine on drives which present 512 B sectors.
 
+**Note:** If you are creating a mirror or raidz topology, this step only installs GRUB on the first disk. The other disk(s) will be handled later.
+
 4.8  Set a root password
 
     # passwd
diff --git a/Debian-Buster-Root-on-ZFS.md b/Debian-Buster-Root-on-ZFS.md
index d552f59..b924e87 100644
--- a/Debian-Buster-Root-on-ZFS.md
+++ b/Debian-Buster-Root-on-ZFS.md
@@ -340,6 +340,8 @@ Install GRUB to the disk(s), not the partition(s).
 
 * The `-s 1` for `mkdosfs` is only necessary for drives which present 4 KiB logical sectors (“4Kn” drives) to meet the minimum cluster size (given the partition size of 512 MiB) for FAT32. It also works fine on drives which present 512 B sectors.
 
+**Note:** If you are creating a mirror or raidz topology, this step only installs GRUB on the first disk. The other disk(s) will be handled later.
+
 4.9  Set a root password
 
     # passwd
diff --git a/Debian-Stretch-Root-on-ZFS.md b/Debian-Stretch-Root-on-ZFS.md
index 0ef046e..08a3679 100644
--- a/Debian-Stretch-Root-on-ZFS.md
+++ b/Debian-Stretch-Root-on-ZFS.md
@@ -350,6 +350,8 @@ Install GRUB to the disk(s), not the partition(s).
 
 * The `-s 1` for `mkdosfs` is only necessary for drives which present 4 KiB logical sectors (“4Kn” drives) to meet the minimum cluster size (given the partition size of 512 MiB) for FAT32. It also works fine on drives which present 512 B sectors.
 
+**Note:** If you are creating a mirror or raidz topology, this step only installs GRUB on the first disk. The other disk(s) will be handled later.
+
 4.9  Set a root password
 
     # passwd
diff --git a/Ubuntu-18.04-Root-on-ZFS.md b/Ubuntu-18.04-Root-on-ZFS.md
index fa047d4..9a64e21 100644
--- a/Ubuntu-18.04-Root-on-ZFS.md
+++ b/Ubuntu-18.04-Root-on-ZFS.md
@@ -348,6 +348,8 @@ Install GRUB to the disk(s), not the partition(s).
 
 * The `-s 1` for `mkdosfs` is only necessary for drives which present 4 KiB logical sectors (“4Kn” drives) to meet the minimum cluster size (given the partition size of 512 MiB) for FAT32. It also works fine on drives which present 512 B sectors.
 
+**Note:** If you are creating a mirror or raidz topology, this step only installs GRUB on the first disk. The other disk(s) will be handled later.
+
 4.9  Set a root password
 
     # passwd