In the context shown, what does "(+ 1 overload)" mean?
<p>Example code: </p>

<pre><code>    protected void btn_Add_Click(object sender, EventArgs e)
    {
        lst_Categories.Items.Insert(lst_Categories.Items.Count, txt_Input.Text);
    }
</code></pre>

<p>Image of context popup over the word "Insert":</p>

<p><a href="https://i.stack.imgur.com/yJ5Zi.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yJ5Zi.jpg" alt="enter image description here"></a>
In the popup shown (see image), of which the words in question is "(+ 1 overload)", what does this phrase mean?</p>