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docs/updating.md

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+# Updating Your Project
+
+To import the changes made to the _Symfony Docker_ template into your project,
+we recommend using [_template-sync_](https://github.com/coopTilleuls/template-sync):
+
+1. Run the script to synchronize your project with the latest version of the skeleton:
+
+   <!-- markdownlint-disable MD013 -->
+
+   ```console
+   curl -sSL https://raw.githubusercontent.com/coopTilleuls/template-sync/main/template-sync.sh | sh -s -- https://github.com/dunglas/symfony-docker
+   ```
+
+   <!-- markdownlint-enable MD013 -->
+
+2. Resolve conflicts, if any
+3. Run `git cherry-pick --continue`
+
+For more advanced options, refer to [the documentation of _template sync_](https://github.com/coopTilleuls/template-sync#template-sync).