diff --git a/index.bs b/index.bs
index ce27c6e31..ef8ba07db 100644
--- a/index.bs
+++ b/index.bs
@@ -2484,8 +2484,7 @@ acquired.
 
 This specifies the options to use in constructing an
 {{AudioBuffer}}. The {{AudioBufferOptions/length}} and {{AudioBufferOptions/sampleRate}} members are
-required. <span class="synchronous">A {{NotFoundError}} exception MUST be thrown if
-any of the required members are not specified.</span>
+required.
 
 <pre class="idl">
 dictionary AudioBufferOptions {