diff --git a/lib/react-markdown.js b/lib/react-markdown.js
index 6dbb085c..9291e7f3 100644
--- a/lib/react-markdown.js
+++ b/lib/react-markdown.js
@@ -12,7 +12,7 @@
  * @typedef PluginOptions
  * @property {PluggableList} [remarkPlugins=[]]
  * @property {PluggableList} [rehypePlugins=[]]
- * @property {import('remark-rehype').Options} [remarkRehypeOptions={}]
+ * @property {import('remark-rehype').Options | undefined} [remarkRehypeOptions={}]
  *
  * @typedef LayoutOptions
  * @property {string} [className]