diff --git a/lib/core.js b/lib/core.js
index b9af506..d1d22f5 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -42,7 +42,7 @@ export function core(schema, defaultTagName, caseSensitive) {
      * @type {{
      *   (): Root
      *   (selector: null|undefined, ...children: HChild[]): Root
-     *   (selector: string, properties: HProperties, ...children: HChild[]): Element
+     *   (selector: string, properties?: HProperties, ...children: HChild[]): Element
      *   (selector: string, ...children: HChild[]): Element
      * }}
      */