diff --git a/doc/go1.12.html b/doc/go1.12.html
index e92d368386..5cd35b94c4 100644
--- a/doc/go1.12.html
+++ b/doc/go1.12.html
@@ -47,6 +47,7 @@ Do not send CLs removing the interior tags from such phrases.
   Go 1.12 is the last release that is supported on FreeBSD 10.x, which has
   already reached end-of-life. Go 1.13 will require FreeBSD 11.2+ or FreeBSD
   12.0+.
+  FreeBSD 12.0+ requires a kernel with the COMPAT_FREEBSD11 option set (this is the default).
 </p>
 
 <p><!-- CL 146898 -->