diff --git a/chapter10/grub.xml b/chapter10/grub.xml
index 965fa56c3..f232a1675 100644
--- a/chapter10/grub.xml
+++ b/chapter10/grub.xml
@@ -150,6 +150,24 @@ menuentry "GNU/Linux, Linux &linux-version;-lfs-&version;" {
 }</literal>
 EOF</userinput></screen>
 
+    <para>
+      The <command>insmod</command> commands load the
+      <application>GRUB</application> modules named
+      <filename>part_gpt</filename> and <filename>ext2</filename>.
+      Despite the naming, <filename>ext2</filename> actually supports
+      <systemitem class='filesystem'>ext2</systemitem>,
+      <systemitem class='filesystem'>ext3</systemitem>, and
+      <systemitem class='filesystem'>ext4</systemitem> filesystems.
+      The <command>grub-install</command> command has embedded some modules
+      into the main <application>GRUB</application> image (installed into
+      the MBR or the GRUB BIOS partition) to access the other modules
+      (in <filename class='directory'>/boot/grub/i386-pc</filename>) without
+      a chicken-or-egg issue, so with a typical configuration these two
+      modules are already embedded and those two <command>insmod</command>
+      commands will do nothing.  But they do no harm anyway, and they may
+      be needed with some rare configurations.
+    </para>
+
     <note><para>From <application>GRUB</application>'s perspective, the
     kernel files are relative to the partition used.  If you
     used a separate /boot partition, remove /boot from the above