diff --git a/README.md b/README.md
index 65eb8122..c2170b35 100644
--- a/README.md
+++ b/README.md
@@ -26,5 +26,5 @@ Demo
 
 ```
 rustc -L. src/demo/main.rs -o demo
-./demo mixer.[png|jpg]
+./demo mixer.[wav|mp3|ogg]
 ```