diff --git a/oregano/Tutorial.md b/oregano/Tutorial.md
index 6358102..731876a 100644
--- a/oregano/Tutorial.md
+++ b/oregano/Tutorial.md
@@ -167,7 +167,7 @@ Didn't implement envelopes yet.
 ;; add envelope to instrument
 (define my-inst (preset-instrument "sine"
     (envelope A S D R))
-
+```