diff --git a/src/test/sound/Readme.md b/src/test/sound/Readme.md
index 6d6c60ce..737ca824 100644
--- a/src/test/sound/Readme.md
+++ b/src/test/sound/Readme.md
@@ -1,3 +1,3 @@
 This is a modified example of sound generation taken from www.waltzballs.org/other/prog.html#audio
 
-
+you need vorbis-tools installed in order to run it.