How to reference to a numbered list item

In my language when I need to add more context/explanation to an item in a numbered list, I write it like so:

First.

Second.

ad 1. [text augmenting Item 1].

The ad is from Latin; thus, I figured it was used in English as well, but when I did use it, some readers were puzzled and asked me what I meant.

Solution 1:

A probably more well known tag (also derived from Latin) might be Re (see Oxford Living Dictionaries). Thus:

The first thing.

The second thing.

Re 1: This also includes the other thing.