diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 6e0ad84..f41e5d4 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -13,3 +13,4 @@ Contributors (by order of appearance) :
 - Jannis Leidel
 - Miki Tebeka
 - David Cramer
+- Peter Teichman
diff --git a/README b/README
index ae235dd..96ab869 100644
--- a/README
+++ b/README
@@ -123,6 +123,31 @@ In order to use Flake8 inside a buildout, edit your buildout.cfg and add this::
     entry-points =
         flake8=flake8.run:main
 
+
+setuptools integration
+======================
+
+If setuptools is available, Flake8 provides a command that checks the
+Python files declared by your project. To use it, add flake8 to your
+setup_requires::
+
+    setup(
+        name="project",
+        packages=["project"],
+
+        setup_requires=[
+            "flake8"
+        ]
+    )
+
+Running ``python setup.py flake8`` on the command line will check the
+files listed in your ``py_modules`` and ``packages``. If any warnings
+are found, the command will exit with an error code::
+
+    $ python setup.py flake8
+    
+
+
 Original projects
 =================
 
diff --git a/flake8/run.py b/flake8/run.py
index 01f60e7..6c89df3 100644
--- a/flake8/run.py
+++ b/flake8/run.py
@@ -114,6 +114,7 @@ class _PEP8Options(object):
     benchmark = False
     testsuite = ''
     doctest = False
+    max_line_length = pep8.MAX_LINE_LENGTH
 
 
 def _initpep8():
@@ -171,5 +172,50 @@ 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.replace(".", os.path.sep)
+
+            if self.distribution.py_modules:
+                for filename in self.distribution.py_modules:
+                    yield "%s.py" % filename
+
+        def run(self):
+            global pep8style
+            pep8style = pep8.StyleGuide(config_file=True)
+
+            _initpep8()
+
+            # _get_python_files can produce the same file several
+            # times, if one of its paths is a parent of another. Keep
+            # a set of checked files to de-duplicate.
+            checked = set()
+
+            warnings = 0
+            for path in _get_python_files(self.distribution_files()):
+                if path not in checked:
+                    warnings += check_file(path)
+                checked.add(path)
+
+            raise SystemExit(warnings > 0)
+
+
 if __name__ == '__main__':
     main()
diff --git a/setup.py b/setup.py
index 3927603..0d85ec6 100755
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-import sys
+import sys
 import os
 
 ispy3 = sys.version_info[0] == 3
@@ -14,11 +14,11 @@ else:
     try:
         from setuptools import setup    # NOQA
         kwargs = {
+            'entry_points':
+                {'distutils.commands': ['flake8 = flake8.run:Flake8Command'],
+                 'console_scripts': ['flake8 = flake8.run:main']},
             'tests_require': ['nose'],
             'test_suite': 'nose.collector',
-            'entry_points': {
-                'console_scripts': ['flake8 = flake8.run:main']
-            },
         }
     except ImportError:
         from distutils.core import setup   # NOQA