diff --git a/REFERENCE-0-preinstall.md b/REFERENCE-0-preinstall.md
index 1e74441..c19244f 100644
--- a/REFERENCE-0-preinstall.md
+++ b/REFERENCE-0-preinstall.md
@@ -18,6 +18,6 @@ Mount all btrfs subvolumes after root has been mounted.
 
 ## subvolumesetup()
 
-BTRFS subvolulme creation and mounting.
+BTRFS subvolulme creation and mounting.