diff --git a/export-image/prerun.sh b/export-image/prerun.sh
index b1585d1..f2a9721 100755
--- a/export-image/prerun.sh
+++ b/export-image/prerun.sh
@@ -27,6 +27,12 @@ RECOVERY_PART_START=$((ROOT_PART_START + ROOT_PART_SIZE))
 RECOVERY_PART_SIZE=$(((RECOVERY_SIZE + ALIGN - 1) / ALIGN * ALIGN))
 IMG_SIZE=$((BOOT_PART_START + BOOT_PART_SIZE + ROOT_PART_SIZE + RECOVERY_PART_SIZE))
 
+echo "Estimated sizes:"
+echo "  Boot partition: $((BOOT_PART_SIZE / 1024 / 1024))MB"
+echo "  Root partition: $((ROOT_PART_SIZE / 1024 / 1024))MB"
+echo "  Recovery partition: $((RECOVERY_PART_SIZE / 1024 / 1024))MB"
+echo "  Total image size: $((IMG_SIZE / 1024 / 1024))MB"
+
 truncate -s "${IMG_SIZE}" "${IMG_FILE}"
 
 parted --script "${IMG_FILE}" mklabel msdos