diff --git a/README.md b/README.md
index aca5707..8cb9422 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ This master branch now reflects the development of the next major release of thi
[See the demo site!](https://react-collapsed.netlify.com/)
+[CodeSandbox demo](https://codesandbox.io/s/magical-browser-vibv2?file=/src/App.tsx)
+
## Installation
```bash
@@ -60,14 +62,14 @@ import React, { useState } from 'react';
import useCollapse from 'react-collapsed';
function Demo() {
- const [isExpanded, setOpen] = useState(false);
+ const [isExpanded, setExpanded] = useState(false);
const { getCollapseProps, getToggleProps } = useCollapse({ isExpanded });
return (