How to use comments in React

How can I use comments inside the `render` method in a React component?

**I have the following component:**

'use strict';
var React = require('react'),
Button = require('./button'),
UnorderedList = require('./unordered-list');

class Dropdown extends React.Component{
constructor(props) {
super(props);
}
handleClick() {
alert('I am click here');
}

render() {
return (
<div className="dropdown">
// whenClicked is a property not an event, per se.
<Button whenClicked={this.handleClick} className="btn-default" title={this.props.title} subTitleClassName="caret"></Button>
<UnorderedList />
</div>
)
}
}

module.exports = Dropdown;

![Enter image description here][1]

My comments are showing up in the UI.

What would be the right approach to apply single and multiple line comments inside a render method of a component?

[1]: