--- a/webaudio/specification.html	Fri Apr 05 16:10:29 2013 -0700
+++ b/webaudio/specification.html	Mon Apr 08 13:23:13 2013 -0400
@@ -2148,7 +2148,7 @@
 
     attribute AudioBuffer? buffer;
 
-    attribute AudioParam playbackRate;
+    readonly attribute AudioParam playbackRate;
 
     attribute boolean loop;
     attribute double loopStart;