diff --git a/index.bs b/index.bs
index fe2364a3b..e8d6ac01b 100644
--- a/index.bs
+++ b/index.bs
@@ -8276,6 +8276,8 @@ time integral of <a>computedOscFrequency</a>, assuming a phase angle
 of zero at the node's exact start time. Its <a>nominal range</a> is
 [-<a>Nyquist frequency</a>, <a>Nyquist frequency</a>].
 
+The single output of this node consists of one channel (mono).
+
 <pre class=include>
 path: audionode.include
 macros: