# Step 3: Comments

Sometimes you might want to make a note for yourself in your code. Comments can be helpful for remembering logic and terminology, and make your code easier to understand for other people.

## Try it out <a href="#try-it-out" id="try-it-out"></a>

To create a single line comment in JavaScript, you place two slashes `//` in front of the code or text. When you place these two slashes, all text to the right of them will be ignored, until the next line.

For example, here's a comment on the line above some code:

```javascript
// checking type of hello world
console.log(typeof 'Hello world!');
```

You can even put comments on the same line as actual code:

```javascript
console.log(typeof 'Hello world!'); // checking type of hello world
```

{% hint style="info" %}

#### Mini challenge <a href="#mini-challenge" id="mini-challenge"></a>

Add some helpful comments to the code you wrote in the last step. Run the code and make sure you haven't broken anything!
{% endhint %}