diff --git a/README.md b/README.md
index e262869..1f8c94c 100644
--- a/README.md
+++ b/README.md
@@ -129,6 +129,7 @@ Otherwise, you can run this command to revert all changes made by the script:
  * `--no-force-gpt` By default, GPT rather than MBR partition table will be created. This option disables it.
  * `--bios` Don't create *EFI system partition*. If GPT is being used, create a *BIOS boot partition* (`bios_grub` partition). Default if `/sys/firmware/efi` is absent. [See](https://askubuntu.com/a/501360)
  * `--efi` Create an *EFI system partition*. Default if `/sys/firmware/efi` exists
+ * `--esp 106` Size of the *EFI system partition*. e.g. `106`, `538` and `1075` result to 100 MiB, 512 MiB, 1 GiB respectively
  * `--filesystem ext4`
  * `--kernel <string>` Choose an package for the kernel image
  * `--cloud-kernel` Choose `linux-image-cloud-amd64` or `...arm64` as the kernel image
diff --git a/debi.sh b/debi.sh
index 2e90fdd..24e9962 100755
--- a/debi.sh
+++ b/debi.sh
@@ -219,6 +219,7 @@ disk_partitioning=true
 disk=
 force_gpt=true
 efi=
+esp=106
 filesystem=ext4
 kernel=
 cloud_kernel=false
@@ -360,6 +361,10 @@ while [ $# -gt 0 ]; do
         --efi)
             efi=true
             ;;
+        --esp)
+            esp=$2
+            shift
+            ;;
         --filesystem)
             filesystem=$2
             shift
@@ -658,8 +663,10 @@ d-i partman-auto/expert_recipe string \
     naive :: \
 EOF
     if [ "$efi" = true ]; then
+        $save_preseed << EOF
+        $esp $esp $esp free \\
+EOF
         $save_preseed << 'EOF'
-        106 106 106 free \
             $iflabel{ gpt } \
             $reusemethod{ } \
             method{ efi } \