<nav id="page_navigation">
    <ul>
        <li><a href="/">Home</a></li>
        <li><a href="/about">About</a></li>
        <li><a href="/archive">Archive</a></li>
        <li><a href="/Notes">Notes</a></li>
    </ul>
</nav>

<nav id="page_navigation">
    <ul>
        <li><a href="/">Home</a></li>
        <li><a href="/about">About</a></li>
        <li><a href="/archive">Archive</a></li>
        <li><a href="/notes">Notes</a></li>
    </ul>
</nav>

Use a case correct url for Notes
Use a case correct url for Notes
