diff --git a/doc/go1.21.html b/doc/go1.21.html
index c25f94a2d9..cbba30975e 100644
--- a/doc/go1.21.html
+++ b/doc/go1.21.html
@@ -511,7 +511,7 @@ Do not send CLs removing the interior tags from such phrases.
 <dl id="crypto/sha256"><dt><a href="/pkg/crypto/sha256/">crypto/sha256</a></dt>
   <dd>
     <p><!-- https://go.dev/issue/50543, CL 408795 -->
-      SHA-224 and SHA-256 operations now use native instructions when available when <code>GOOS=amd64</code>, providing a performance improvement on the order of 3-4x.
+      SHA-224 and SHA-256 operations now use native instructions when available when <code>GOARCH=amd64</code>, providing a performance improvement on the order of 3-4x.
     </p>
   </dd>
 </dl><!-- crypto/sha256 -->