diff --git a/scribble-lib/scribble/manual-racket.css b/scribble-lib/scribble/manual-racket.css
index dc004316..a23f931c 100644
--- a/scribble-lib/scribble/manual-racket.css
+++ b/scribble-lib/scribble/manual-racket.css
@@ -88,6 +88,7 @@ span.RktValDef, span.RktStxDef, span.RktSymDef
 
 .RktOpt {
   color: black;
+  font-style: italic;
 }
 
 .RktKw {
diff --git a/scribble-lib/scribble/racket.css b/scribble-lib/scribble/racket.css
index b44fef59..4889563a 100644
--- a/scribble-lib/scribble/racket.css
+++ b/scribble-lib/scribble/racket.css
@@ -70,6 +70,7 @@
 
 .RktOpt {
   color: black;
+  font-style: italic;
 }
 
 .RktKw {