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# YAML frontmatter
Markdown being a simple format, it does not offer any way to attach additional metadata to a note. The community came up with a solution by inserting a YAML header at the top of each note to contain its metadata. This method is widely supported among Zettelkasten softwares, including `zk`.
```yaml
---
title:Improve the structure of essays by rewriting
| `title` | Title of the note – takes precedence over the first heading |
| `date` | Creation date – takes precedence over the file date |
| `tags` | List of tags attached to this note |
| `keywords` | Alias for `tags` |
| `aliases` | Alternative titles for this note, used by `--mention` |
All metadata are indexed and can be printed in `zk list` output, using the template variable `{{metadata.<key>}}`, e.g. `{{metadata.description}}`. The keys are normalized to lower case.