diff --git a/debian/create.efi.device.sh b/debian/create.efi.device.sh
index abbb1a1..e526094 100755
--- a/debian/create.efi.device.sh
+++ b/debian/create.efi.device.sh
@@ -1,5 +1,14 @@
 #!/bin/sh
 
+# Mostly intended to be used to create a boot device with an USB key
+
+# Ask the device to use for EFI partition
+# Create partition label and new partition if not present
+# Format the partition
+# Create the mountpoint and mount the partition
+# Add an entry in /etc/fstab with systemd-automount
+# Install efibootmgr and efivar to be able to manage EFI entries
+
 EFI_MOUNTPATH="/boot/efi"
 
 # Show a warning if not in a chroot (a rescue/chroot mode is mostly attempted)
@@ -8,7 +17,8 @@ if ! ischroot; then
 fi
 
 # Select the future EFI partition
-printf "%b" "Select device and partition to use for UEFI Stub (eg. /dev/sdd1) :\n"
+printf "%b" "All data on the selected device will be deleted ! Be sure to know what you are doing !\n"
+printf "%b" "Select device and partition to use for UEFI Stub (eg. /dev/sdX1) :\n"
 read -r EFI_PARTITION
 
 # Test if partition exists