diff --git a/doc/style.css b/doc/style.css
index b9b468d65ba..68a43f9b21b 100644
--- a/doc/style.css
+++ b/doc/style.css
@@ -10,6 +10,9 @@ pre, code {
 pre .comment {
 	color: #375EAB;
 }
+pre .ln {
+	color: #999;
+}
 body {
 	color: #222;
 }