diff --git a/archfi b/archfi
index 22d50fc..25b42a0 100644
--- a/archfi
+++ b/archfi
@@ -578,6 +578,16 @@ formatdevice(){
     btrfs)
       echo "mkfs.btrfs -f $2"
       mkfs.btrfs -f $2
+      if [ "$1" = "root" ]; then
+        echo "mount $2 /mnt"
+        echo "btrfs subvolume create /mnt/root"
+        echo "btrfs subvolume set-default /mnt/root"
+        echo "umount /mnt"
+        mount $2 /mnt
+        btrfs subvolume create /mnt/root
+        btrfs subvolume set-default /mnt/root
+        umount /mnt
+      fi
     ;;
     reiserfs)
       echo "mkfs.reiserfs -f $2"