diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index ea511d5e9..7070412e8 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -31,6 +31,12 @@
 
 <h2 align="center">Changes in 3.16.0.1 made since 3.15.3</h2>
 
+<h3>Echoless comments</h3>
+
+<p>The way comments are parsed by the iocsh interpreter has changed. The
+interpreter can be selectively disabled from echoing comments coming from
+a script by starting those lines with '#-' rather than just '#'.</p>
+
 <h3>Build support for CapFast and dbst removed</h3>
 
 <p>The build rules associated with the CapFast-related tools <tt>sch2edif</tt>