diff --git a/README.md b/README.md
index 67cbba9..38ffa1f 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,7 @@ var simplemde = new SimpleMDE({
 		unique_id: "MyUniqueID",
 		delay: 1000,
 	},
+	preview_render: my_custom_preview_function,
 });
 ```