# Reference Data

{% embed url="<https://youtu.be/kab41KKWXWA>" %}
How to upload reference data.
{% endembed %}

When you use [category](/adnuntius-advertising/admin-ui/advertising/targeting.md#category-targeting) or [key value](/adnuntius-advertising/admin-ui/advertising/targeting.md#key-value-targeting) targeting on line items or creatives, it can be hard to remember how a categories (as defined by the URL structure) are designed on your site, or which key values are being sent with the ad requests. Reference data lets you upload a text file that creates a library of categories and key values that you can choose from, rather than remember them all.

![Example category targeting where reference data has been added](/files/-LSBHE7BWkgaJNW4KZ4s)

**Category uploader**: Just create a .txt file where each line specifies a new category that you want to add. Below is a template that you can download and use if you are in doubt.

{% file src="/files/-M3D4ojZ4VLTEsOArK95" %}
Template for categories
{% endfile %}

**Key value uploader**: Just create a .txt file where each line specifies a new key-value entry and commas separate the data like so: mykey, myfirstvalue, mysecondvalue. Below is a template that you can download and use if you are in doubt.

{% file src="/files/-M3D5AzqONG\_MMTApD9u" %}
Template for key values
{% endfile %}


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