diff --git a/README.md b/README.md
index fa5afca3..8a11eaf9 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ The `DomHandler` produces a DOM (document object model) that can be manipulated
 ```js
 const htmlparser2 = require("htmlparser2");
 
-const dom = htmlparser2.parseDocument();
+const dom = htmlparser2.parseDocument(htmlString);
 ```
 
 The `DomHandler`, while still bundled with this module, was moved to its [own module](https://github.com/fb55/domhandler).