# Appendix

This section collects supplementary articles that do not fit into the other sections, such as migration guides and comparisons between the discontinued `td-agent` versions.

## Articles

* [Update from v0.12 to v1](update-from-v0.12.md): how to update Fluentd to v1.0 from v0.12 or earlier.
* [td-agent v2 vs v3 vs v4](td-agent-v2-vs-v3-vs-v4.md): differences between the `td-agent` series, kept for reference. Note that `td-agent` has already reached End of Life \(EOL\); use [`fluent-package`](../installation/install-fluent-package/) instead.