diff --git a/doc/go1.20.html b/doc/go1.20.html
index 177b27eaeb..26f65f28d0 100644
--- a/doc/go1.20.html
+++ b/doc/go1.20.html
@@ -67,6 +67,13 @@ Do not send CLs removing the interior tags from such phrases.
 
 <h2 id="ports">Ports</h2>
 
+<h3 id="darwin">Darwin and iOS</h3>
+
+<p><!-- golang.org/issue/23011 -->
+  Go 1.20 is the last release that will run on macOS 10.13 High Sierra or 10.14 Mojave.
+  Go 1.21 will require macOS 10.15 Catalina or later.
+</p>
+
 <h3 id="freebsd-riscv">FreeBSD/RISC-V</h3>
 
 <p><!-- https://go.dev/issue/53466 -->