diff --git a/README.rst b/README.rst
index 797ec73..61e21a1 100644
--- a/README.rst
+++ b/README.rst
@@ -64,8 +64,9 @@ Real life example::
   max-line-length = 100
   known-modules = my-lib:[mylib.drm,mylib.encryption]
 
-If you use `flake8-pyproject <https://pypi.org/project/Flake8-pyproject/>`_, you can also configure
-the known modules using a nicer syntax::
+If you use `Flake8-pyproject <https://pypi.org/project/Flake8-pyproject/>`_
+(can include for installation using ``flake8-requirements[pyproject]``),
+you can also configure the known modules using a nicer syntax in ``pyproject.toml``::
 
   $ cat pyproject.toml
   ...
diff --git a/setup.py b/setup.py
index 0ab5f33..5c33bab 100644
--- a/setup.py
+++ b/setup.py
@@ -29,6 +29,7 @@ def get_abs_path(pathname):
         "setuptools >= 10.0.0",
         "tomli>=1.2.1; python_version < '3.11'",
     ],
+    extras_require={"pyproject": ["Flake8-pyproject"]},
     setup_requires=["pytest-runner"],
     tests_require=["mock", "pytest"],
     entry_points={
diff --git a/src/flake8_requirements/checker.py b/src/flake8_requirements/checker.py
index 77b83d7..4183204 100644
--- a/src/flake8_requirements/checker.py
+++ b/src/flake8_requirements/checker.py
@@ -20,7 +20,7 @@
 from .modules import STDLIB_PY3
 
 # NOTE: Changing this number will alter package version as well.
-__version__ = "2.0.2"
+__version__ = "2.1.0"
 __license__ = "MIT"
 
 LOG = getLogger('flake8.plugin.requirements')