diff --git a/files/lxd-export.sh b/files/lxd-export.sh
index 4a66857..7abf364 100644
--- a/files/lxd-export.sh
+++ b/files/lxd-export.sh
@@ -3,5 +3,7 @@ set -euo pipefail
 
 cd /var/backups/lxd
 for i in $(lxc list --format csv -c n); do
+  # Don't use --optimized-storage as Borg will not be able to compress or chunk
+  # it properly
   lxc export $i ${i}.tar --instance-only --compression none
 done