diff --git a/notes.md b/notes.md
index 2f06f8a..8e8e650 100644
--- a/notes.md
+++ b/notes.md
@@ -16,7 +16,7 @@ Format partitions:
 
     $ sudo mkfs.fat -F32 -nESP /dev/nvme0n1p1
     mkfs.fat 4.1 (2017-01-24)
-    $ mkfs.ext4 -L boot /dev/nvme0n1p2
+    $ sudo mkfs.ext4 -L boot /dev/nvme0n1p2
     […]
     $ sudo cryptsetup luksFormat /dev/nvme0n1p3
     $ sudo cryptsetup luksOpen /dev/nvme0n1p3 nvme0n1p3_crypt