diff --git a/README.md b/README.md
index b110908..1b87276 100644
--- a/README.md
+++ b/README.md
@@ -57,8 +57,8 @@ On MBR:
     parted /dev/sdX
       mktable GPT
       mkpart primary 1MiB 2MiB
-      mkpart primary 2MiB 500MiB
-      mkpart primary 500MiB 100%
+      mkpart primary 2MiB 512MiB
+      mkpart primary 512MiB 100%
       set 1 bios_grub on
       disk_toggle pmbr_boot
       quit