diff --git a/src/to_dom.js b/src/to_dom.js
index 4e617f0..b545c96 100644
--- a/src/to_dom.js
+++ b/src/to_dom.js
@@ -36,7 +36,7 @@ export class DOMSerializer {
     this.marks = marks || {}
   }
 
-  // :: (Fragment, ?Object) → dom.DocumentFragment
+  // :: (Fragment, ?Object, ?dom.Node) → dom.DocumentFragment
   // Serialize the content of this fragment to a DOM fragment. When
   // not in the browser, the `document` option, containing a DOM
   // document, should be passed so that the serializer can create