diff --git a/lib/syntax.default b/lib/syntax.default
index 6b8e5cf333..9d8a9d9ef0 100644
--- a/lib/syntax.default
+++ b/lib/syntax.default
@@ -730,3 +730,15 @@ empheq
 % Sweave stuff
 \Sexpr{}
 \SweaveOpts{}
+\SweaveInput{}
+\SweaveSyntax{}
+\Scoderef{}
+
+\Rcode{}
+\Robject{}
+\Rcommand{}
+\Rfunction{}
+\Rfunarg{}
+\Rpackage{}
+\Rclass{}
+\Rmethod{}