HTML elements are often nested within other HTML elements. In the previous step you nested the `h2` element, comment and `p` element within the `main` element. A nested element is a child of its parent element.
To make HTML easier to read, indent the `h2` element, the comment, and `p` element exactly two spaces to indicate they are children of the `main` element.
Your should have an `h2` element with text `Cat Photos`. You may have accidentally deleted it, it is missing both opening and closing tags, or the text has changed.