diff --git a/preseed/debian/buster/preseed.cfg b/preseed/debian/buster/preseed.cfg
index 3a9ffa3..4ea5b40 100644
--- a/preseed/debian/buster/preseed.cfg
+++ b/preseed/debian/buster/preseed.cfg
@@ -160,12 +160,12 @@ d-i partman-lvm/confirm                           boolean     true
 d-i partman-lvm/confirm_nooverwrite               boolean     true
 
 ## Volume Group/vg name
-d-i partman-auto-lvm/new_vg_name                string  sys
+d-i partman-auto-lvm/new_vg_name                  string      sys
+### From buster, need to specify the expected size
+d-i partman-auto-lvm/guided_size                  string      max
 
 ## LVM partition
-### This recipe need almost 30Gb free space it's add all <min size>
-###   sda2 (16Gb), lv_* (~14Gb) then it should not count it because
-###   all logical volume are on sda2 ...
+### This recipe need almost 30Gb free space.
 d-i   partman-auto/expert_recipe                  string      \
       boot-root ::                                            \
               200 200000 250 ext3                             \
@@ -372,3 +372,4 @@ in-target /bin/sed -i 's/\(^\|^\#\)\(PermitRootLogin\).*/\2 yes/g' /etc/ssh/sshd
 in-target /usr/bin/tftp 129.20.203.27 -c get scripts/latecommand.tar.gz /tmp/latecommand.tar.gz ; \
 in-target tar xzf /tmp/latecommand.tar.gz -C /tmp/ ; \
 in-target /bin/sh /tmp/latecommand/post.buster.sh
+################################################################## ]]]