diff --git a/audio-v2.md b/audio-v2.md
index dd40fe6..0d49016 100644
--- a/audio-v2.md
+++ b/audio-v2.md
@@ -49,7 +49,8 @@ This proposal makes four changes:
 The `duration` and `vector` ports precisely specify the audio device
 behavior. The given note should be played for a number of milliseconds
 specified by `duration`, at which point the `vector` should be called
-to play the next note (or next silence).
+to play the next note (or next silence). For example if the duration
+is `0x04b0` then the note should play for 1.2 seconds (1200 ms).
 
 ## More flexible envelope settings