Document installation via `poetry self add`

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diff --git a/README.md b/README.md
index 4ee3fb4..1308a51 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,15 @@ Installation depends on how you installed Poetry. With
 pipx inject poetry poetry-restrict-plugin
 ```
 
+Alternatively, you can install it with `poetry self add`:
+
+```sh
+poetry self add poetry-restrict-plugin
+```
+
+See `poetry self add --help` for more options for installation, including
+installing development versions.
+
 For other installation methods, see the [Poetry plugin
 documentation](https://python-poetry.org/docs/plugins/#using-plugins).