diff --git a/doc/go1.18.html b/doc/go1.18.html
index b320579c37..1ca0a5560d 100644
--- a/doc/go1.18.html
+++ b/doc/go1.18.html
@@ -512,6 +512,12 @@ For more information, see <a href="https://go.dev/design/draft-gobuild">https://
   after each value that may be inaccurate.
 </p>
 
+<p><!-- CL 347917 -->
+  The built-in function <code>append</code> now uses a slightly different formula
+  when deciding how much to grow a slice when it must allocate a new underlying array.
+  The new formula is less prone to sudden transitions in allocation behavior.
+</p>
+
 <h2 id="compiler">Compiler</h2>
 
 <p><!-- https://golang.org/issue/40724 -->