Document using pdm for pyproject.toml

Author: adamtheturtle

README.rst

@@ -85,6 +85,17 @@ check by name (or glob pattern) using `--ignore-module` (shorthand is `-m`)::
     pip-missing-reqs --ignore-module=spam --ignore-module=spam.* sample
 
 
+Using `pyproject.toml` instead of `requirements.txt`
+----------------------------------------------------
+
+If your project uses `pyproject.toml` instead of `requirements.txt`, you can
+use an external tool like `pdm` to convert it to `requirements.txt`::
+
+    # requires `pip install pdm`
+    pdm export --pyproject > requirements.txt
+
+Then you can use `pip-missing-reqs` and `pip-extra-reqs` as usual.
+
 With Thanks To
 --------------