# How to use \<Reserved\> correctly?

**URL:** https://community.mp3tag.de/t/how-to-use-reserved-correctly/53812
**Category:** General Discussion
**Created:** [July 20, 2021, 1:37pm UTC](https://community.mp3tag.de/t/how-to-use-reserved-correctly/53812 "2021-07-20T13:37:19Z")
**Posts on this page:** 1
**Showing post:** 2

<div class="post-metadata">

### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [July 20, 2021, 1:50pm UTC](https://community.mp3tag.de/t/how-to-use-reserved-correctly/53812/2 "2021-07-20T13:50:23Z")

</div>

If you use the tag panel then you can input only real characters but no variables.  
The `<keep>` refers to "keep all the data that is already there as is". Any modification would adopt only that. (Which is more or less what you found out).

To append a string to a field, see the FAQs on [How to append a string to a field](https://community.mp3tag.de/t/actions-and-batch-operations/967/5)

---

_[View the full topic](https://community.mp3tag.de/t/how-to-use-reserved-correctly/53812)._