Sure, here is an example of how you can use the "label" tag in HTML along with the "p" tag to add some additional content:

```html

Username:

This is some additional text that could be wrapped in a "p" tag.

```

In this example, the "label" tag is used to create a label for the input field with the id "username". The "p" tag is then used to add some additional text below the label and input field.