diff --git a/flake8/run.py b/flake8/run.py
index 7d5b137..bcc3308 100644
--- a/flake8/run.py
+++ b/flake8/run.py
@@ -164,5 +164,40 @@ def hg_hook(ui, repo, **kwargs):
 
     return 0
 
+
+try:
+    from setuptools import Command
+except ImportError:
+    Flake8Command = None
+else:
+    class Flake8Command(Command):
+        description = "Run flake8 on modules registered in setuptools"
+        user_options = []
+
+        def initialize_options(self):
+            pass
+
+        def finalize_options(self):
+            pass
+
+        def distribution_files(self):
+            if self.distribution.packages:
+                for package in self.distribution.packages:
+                    yield package
+
+            if self.distribution.py_modules:
+                for filename in self.distribution.py_modules:
+                    yield "%s.py" % filename
+
+        def run(self):
+            _initpep8()
+
+            warnings = 0
+            for path in _get_python_files(self.distribution_files()):
+                warnings += check_file(path)
+
+            raise SystemExit(warnings > 0)
+
+
 if __name__ == '__main__':
     main()
diff --git a/setup.py b/setup.py
index dee5365..1dc5694 100755
--- a/setup.py
+++ b/setup.py
@@ -24,6 +24,11 @@ setup(
     url="http://bitbucket.org/tarek/flake8",
     packages=["flake8", "flake8.tests"],
     scripts=["flake8/flake8"],
+    entry_points = {
+        "distutils.commands": [
+            "flake8 = flake8.run:Flake8Command",
+        ],
+    },
     long_description=README,
     classifiers=[
         "Environment :: Console",