diff --git a/sys/BootSync/sample.config.xml b/sys/BootSync/sample.config.xml
index 43e564c..bdf9bfd 100644
--- a/sys/BootSync/sample.config.xml
+++ b/sys/BootSync/sample.config.xml
@@ -11,7 +11,8 @@ SEE prep.txt FOR WHAT MUST BE DONE BEFORE RUNNING BOOTSYNC.
     <!-- Each drive should be prepared ahead of time with efibootmgr and grub-install (see prep.txt). -->
     <partitions>
         <!-- These should all be unique values.
-             Don't do something dumb like mount the same partition on the same mountpoint. -->
+             Don't do something dumb like mount different partitions on the same mountpoint or the
+             the same partition on multiple mountpoints. -->
         <!-- Future versions of this script may support things like UUIDs or labels as an alternative to path=,
              but in the meanwhile it relies on device paths explicitly. -->
         <part path="/dev/sdb1" mount="/mnt/boot1"/>
@@ -85,4 +86,4 @@ SEE prep.txt FOR WHAT MUST BE DONE BEFORE RUNNING BOOTSYNC.
              (e.g. https://wiki.archlinux.org/index.php/Multiboot_USB_drive#Using_GRUB_and_loopback_devices) -->
         <path hashtype="false" source="/boot/iso" target="iso" pattern="^.*\.(iso|img)$"/>
     </syncPaths>
-</bootsync>
\ No newline at end of file
+</bootsync>