diff --git a/doc/arm/notes-new-features.xml b/doc/arm/notes-new-features.xml
index cd3ef59018..bf634a71cd 100644
--- a/doc/arm/notes-new-features.xml
+++ b/doc/arm/notes-new-features.xml
@@ -11,6 +11,13 @@
 
 <section xml:id="relnotes_features"><info><title>New Features</title></info>
   <itemizedlist>
+    <listitem>
+      <para>
+        Added a new statistics variable <command>tcp-highwater</command>
+        that reports the maximum number of simultaneous TCP clients BIND
+        has handled while running.
+      </para>
+    </listitem>
     <listitem>
       <para>
         Added a new command line option to <command>dig</command>: