diff --git a/example/boot-raid1.nix b/example/boot-raid1.nix
index 8fbe73b..89a108c 100644
--- a/example/boot-raid1.nix
+++ b/example/boot-raid1.nix
@@ -9,7 +9,7 @@
           partitions = {
             boot = {
               size = "1M";
-              type = "EF02";
+              type = "EF02"; # for grub MBR
             };
             ESP = {
               size = "100M";
@@ -37,7 +37,7 @@
           partitions = {
             boot = {
               size = "1M";
-              type = "EF02";
+              type = "EF02"; # for grub MBR
             };
             ESP = {
               size = "128M";
diff --git a/example/gpt-bios-compat.nix b/example/gpt-bios-compat.nix
index 6ace866..f0e8f97 100644
--- a/example/gpt-bios-compat.nix
+++ b/example/gpt-bios-compat.nix
@@ -10,7 +10,7 @@
           partitions = {
             boot = {
               size = "1M";
-              type = "EF02";
+              type = "EF02"; # for grub MBR
             };
             root = {
               size = "100%";
diff --git a/example/hybrid-tmpfs-on-root.nix b/example/hybrid-tmpfs-on-root.nix
index 61a76e4..308f7bf 100644
--- a/example/hybrid-tmpfs-on-root.nix
+++ b/example/hybrid-tmpfs-on-root.nix
@@ -8,7 +8,7 @@
         partitions = {
           boot = {
             size = "1M";
-            type = "EF02";
+            type = "EF02"; # for grub MBR
           };
           ESP = {
             name = "ESP";
diff --git a/example/hybrid.nix b/example/hybrid.nix
index 61762cc..50176e0 100644
--- a/example/hybrid.nix
+++ b/example/hybrid.nix
@@ -9,7 +9,7 @@
           partitions = {
             boot = {
               size = "1M";
-              type = "EF02";
+              type = "EF02"; # for grub MBR
             };
             ESP = {
               size = "512M";
diff --git a/example/mdadm.nix b/example/mdadm.nix
index 08178d2..33faac9 100644
--- a/example/mdadm.nix
+++ b/example/mdadm.nix
@@ -9,7 +9,7 @@
           partitions = {
             boot = {
               size = "1M";
-              type = "EF02";
+              type = "EF02"; # for grub MBR
             };
             mdadm = {
               size = "100%";
@@ -29,7 +29,7 @@
           partitions = {
             boot = {
               size = "1M";
-              type = "EF02";
+              type = "EF02"; # for grub MBR
             };
             mdadm = {
               size = "100%";