diff --git a/.travis.yml b/.travis.yml
index dd4eeed..449189d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ python:
   - 3.7
 install:
   - pip install -e .
-  - pip install -r test-requirements.txt
+  - pip install -r requires/testing.txt
   - pip install tornado
 script: nosetests
 after_success:
diff --git a/HISTORY.rst b/HISTORY.rst
index f37329e..3182a21 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,6 +1,12 @@
 Version History
 ---------------
 
+`2.0.1`_ (18-Mar-2019)
+~~~~~~~~~~~~~~~~~~~~~~
+- Add support for Tornado 6
+- Move requirements files to requires/
+- Increase test coverage
+
 `2.0.0`_ (26-Nov-2018)
 ~~~~~~~~~~~~~~~~~~~~~~
 - Drop support for Python 2.7, 3.3, 3.4
@@ -15,6 +21,7 @@ Version History
 ~~~~~~~~~~~~~~~~~~~~~~
  - Adds ``sprockets.mixins.correlation.HandlerMixin``
 
+.. _`2.0.1`: https://github.com/sprockets/sprockets.mixins.correlation/compare/2.0.0...2.0.1
 .. _`2.0.0`: https://github.com/sprockets/sprockets.mixins.correlation/compare/1.0.2...2.0.0
 .. _`1.0.2`: https://github.com/sprockets/sprockets.mixins.correlation/compare/1.0.1...1.0.2
 .. _`1.0.1`: https://github.com/sprockets/sprockets.mixins.correlation/compare/0.0.0...1.0.1
diff --git a/LICENSE b/LICENSE
index 4fa05e6..7483ed3 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2015-2018 AWeber Communications
+Copyright (c) 2015-2019 AWeber Communications
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
diff --git a/dev-requirements.txt b/dev-requirements.txt
deleted file mode 100644
index 8870054..0000000
--- a/dev-requirements.txt
+++ /dev/null
@@ -1,5 +0,0 @@
--r requirements.txt
--r test-requirements.txt
-flake8
-sphinx>=1.2,<2
-sphinx-rtd-theme>=0.1,<1.0
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index b33c704..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-tornado>=4.0,<5.2
diff --git a/requires/development.txt b/requires/development.txt
new file mode 100644
index 0000000..6bd8b2d
--- /dev/null
+++ b/requires/development.txt
@@ -0,0 +1,7 @@
+-r requires/installation.txt
+-r requires/testing.txt
+-e .
+
+flake8
+sphinx>=1.2,<2
+sphinx-rtd-theme>=0.1,<1.0
diff --git a/requires/installation.txt b/requires/installation.txt
new file mode 100644
index 0000000..44d8d5a
--- /dev/null
+++ b/requires/installation.txt
@@ -0,0 +1 @@
+tornado>=4.3,<7
diff --git a/test-requirements.txt b/requires/testing.txt
similarity index 100%
rename from test-requirements.txt
rename to requires/testing.txt
diff --git a/setup.py b/setup.py
index c9c7f31..e596df6 100755
--- a/setup.py
+++ b/setup.py
@@ -51,8 +51,8 @@ setuptools.setup(
     ],
     packages=setuptools.find_packages(),
     namespace_packages=['sprockets'],
-    install_requires=read_requirements('requirements.txt'),
-    tests_require=read_requirements('test-requirements.txt'),
+    install_requires=read_requirements('installation.txt'),
+    tests_require=read_requirements('testing.txt'),
     test_suite='nose.collector',
     zip_safe=True,
 )
diff --git a/sprockets/mixins/correlation/__init__.py b/sprockets/mixins/correlation/__init__.py
index 1611839..ff54cb0 100644
--- a/sprockets/mixins/correlation/__init__.py
+++ b/sprockets/mixins/correlation/__init__.py
@@ -7,5 +7,5 @@ except ImportError:
             raise ImportError
 
 
-version_info = (2, 0, 0)
+version_info = (2, 0, 1)
 __version__ = '.'.join(str(v) for v in version_info[:3])
diff --git a/tests.py b/tests.py
index 72ac07f..d5877b2 100644
--- a/tests.py
+++ b/tests.py
@@ -1,20 +1,28 @@
 import uuid
 import unittest
+import unittest.mock
 
 from tornado import testing, web
 
 from sprockets.mixins import correlation
+from sprockets.mixins.correlation.mixins import correlation_id_logger
 
 
-class CorrelatedRequestHandler(correlation.HandlerMixin, web.RequestHandler):
+class RequestHandler(web.RequestHandler):
 
     def get(self, status_code):
         status_code = int(status_code)
+        self.set_status(status_code)
+
         if status_code >= 300:
             raise web.HTTPError(status_code)
         self.write('status {0}'.format(status_code))
 
 
+class CorrelatedRequestHandler(correlation.HandlerMixin, RequestHandler):
+    pass
+
+
 class CorrelationMixinTests(testing.AsyncHTTPTestCase):
 
     def get_app(self):
@@ -35,3 +43,83 @@ class CorrelationMixinTests(testing.AsyncHTTPTestCase):
         response = self.fetch('/status/500',
                               headers={'Correlation-Id': correlation_id})
         self.assertEqual(response.headers['correlation-id'], correlation_id)
+
+
+class CorrelationIDLoggerTests(testing.AsyncHTTPTestCase):
+
+    def get_app(self):
+        return web.Application([
+            (r'/status/(?P<status_code>\d+)', CorrelatedRequestHandler),
+            (r'/status/no-correlation/(?P<status_code>\d+)', RequestHandler),
+        ], log_function=correlation_id_logger)
+
+    def setUp(self):
+        self.patcher = unittest.mock.patch(
+            'sprockets.mixins.correlation.mixins.log.access_log')
+        self.access_logger = self.patcher.start()
+        super().setUp()
+
+    def tearDown(self):
+        self.patcher.stop()
+        super().tearDown()
+
+    def test_lt_400_logs_info(self):
+        for status in (200, 202):
+            response = self.fetch('/status/{}'.format(status))
+
+            self.access_logger.info.assert_any_call(
+                "%d %s %.2fms {CID %s}",
+                status,
+                unittest.mock.ANY,
+                unittest.mock.ANY,
+                response.headers['correlation-id']
+            )
+
+    def test_gte_400_lt_500_logs_warning(self):
+        for status in (400, 429):
+            response = self.fetch('/status/{}'.format(status))
+
+            self.access_logger.warning.assert_any_call(
+                "%d %s %.2fms {CID %s}",
+                status,
+                unittest.mock.ANY,
+                unittest.mock.ANY,
+                response.headers['correlation-id']
+            )
+
+    def test_gte_500_logs_error(self):
+        for status in (500, 504):
+            response = self.fetch('/status/{}'.format(status))
+
+            self.access_logger.error.assert_any_call(
+                "%d %s %.2fms {CID %s}",
+                status,
+                unittest.mock.ANY,
+                unittest.mock.ANY,
+                response.headers['correlation-id']
+            )
+
+    def test_uses_correlation_id_from_header_if_missing_from_handler(self):
+        correlation_id = uuid.uuid4().hex
+
+        self.fetch('/status/no-correlation/200',
+                   headers={'Correlation-Id': correlation_id})
+
+        self.access_logger.info.assert_any_call(
+            "%d %s %.2fms {CID %s}",
+            200,
+            unittest.mock.ANY,
+            unittest.mock.ANY,
+            correlation_id
+        )
+
+    def test_correlation_id_is_none_if_missing_from_handler_and_header(self):
+        self.fetch('/status/no-correlation/200')
+
+        self.access_logger.info.assert_any_call(
+            "%d %s %.2fms {CID %s}",
+            200,
+            unittest.mock.ANY,
+            unittest.mock.ANY,
+            None
+        )
diff --git a/tox.ini b/tox.ini
index cba03ff..6ce36fe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,20 +1,25 @@
 [tox]
-envlist = py35,py36,py37,tornado43,torando51
+envlist = py35,py36,py37,tornado43,tornado51,tornado6
 toxworkdir = {toxinidir}/build/tox
 skip_missing_intepreters = true
 
 [testenv]
 deps =
-	-rtest-requirements.txt
+	-r requires/testing.txt
 	tornado
 commands = {envbindir}/nosetests
 
 [testenv:tornado43]
 deps =
-	-rtest-requirements.txt
+	-r requires/testing.txt
 	tornado>=4.3,<4.4
 
 [testenv:tornado51]
 deps =
-	-rtest-requirements.txt
+	-r requires/testing.txt
 	tornado>=5.1,<5.2
+
+[testenv:tornado6]
+deps =
+	-r requires/testing.txt
+	tornado>=6,<7