diff --git a/hermes/index.html b/hermes/index.html
index 35fae78..f3c87ae 100644
--- a/hermes/index.html
+++ b/hermes/index.html
@@ -319,7 +319,9 @@
 <div class="note"><b>Design documents.</b> The protocol design is in
   <a href="https://code.silentmode.st/silentmode/silentmode/src/branch/master/Hermes/DESIGN-hermes.md">Hermes/DESIGN-hermes.md</a>,
   the Android plan in <code class="inline">DESIGN-mobile-hermes.md</code>, and the free
-  sub-identity scheme in <code class="inline">DESIGN-sub-identity-manifest.md</code>, all in the
+  sub-identity scheme in <code class="inline">DESIGN-sub-identity-manifest.md</code>, the mail
+  gateway (<code class="inline">hello@theseus.x</code> and the <code class="inline">.silentmode.st</code> bridge) in
+  <code class="inline">DESIGN-mail-gateway.md</code>, all in the
   same folder. The desktop client ships as a bundled Theseus add-on and updates on its own channel,
   independent of browser releases.</div>