diff --git a/quamash/__init__.py b/quamash/__init__.py
index fb883a3..ee8e45c 100644
--- a/quamash/__init__.py
+++ b/quamash/__init__.py
@@ -57,8 +57,9 @@
 
 @with_logger
 class _QThreadWorker(QtCore.QThread):
+
 	"""
-	Read from the queue.
+	Read jobs from the queue and then execute them.
 
 	For use by the QThreadExecutor
 	"""
@@ -104,6 +105,7 @@ def wait(self):
 
 @with_logger
 class QThreadExecutor:
+
 	"""
 	ThreadExecutor that produces QThreads.
 
@@ -225,6 +227,7 @@ class Signaler(QtCore.QObject):
 
 @with_logger
 class QEventLoop(_baseclass):
+
 	"""
 	Implementation of asyncio event loop that uses the Qt Event loop.
 
@@ -404,7 +407,6 @@ def add_reader(self, fd, callback, *args):
 
 	def remove_reader(self, fd):
 		"""Remove reader callback."""
-
 		if self.is_closed():
 			return
 
@@ -441,7 +443,6 @@ def add_writer(self, fd, callback, *args):
 
 	def remove_writer(self, fd):
 		"""Remove writer callback."""
-
 		if self.is_closed():
 			return
 
diff --git a/quamash/_unix.py b/quamash/_unix.py
index d50054b..fafed92 100644
--- a/quamash/_unix.py
+++ b/quamash/_unix.py
@@ -16,7 +16,8 @@
 
 
 def _fileobj_to_fd(fileobj):
-	"""Return a file descriptor from a file object.
+	"""
+	Return a file descriptor from a file object.
 
 	Parameters:
 	fileobj -- file object or file descriptor
@@ -32,14 +33,15 @@ def _fileobj_to_fd(fileobj):
 	else:
 		try:
 			fd = int(fileobj.fileno())
-		except (AttributeError, TypeError, ValueError):
-			raise ValueError("Invalid file object: {!r}".format(fileobj)) from None
+		except (AttributeError, TypeError, ValueError) as ex:
+			raise ValueError("Invalid file object: {!r}".format(fileobj)) from ex
 	if fd < 0:
 		raise ValueError("Invalid file descriptor: {}".format(fd))
 	return fd
 
 
 class _SelectorMapping(collections.Mapping):
+
 	"""Mapping of file objects to selector keys."""
 
 	def __init__(self, selector):
@@ -170,7 +172,8 @@ def get_map(self):
 		return self.__map
 
 	def _key_from_fd(self, fd):
-		"""Return the key associated to a given file descriptor.
+		"""
+		Return the key associated to a given file descriptor.
 
 		Parameters:
 		fd -- file descriptor
diff --git a/quamash/_windows.py b/quamash/_windows.py
index 18afe81..f442a63 100644
--- a/quamash/_windows.py
+++ b/quamash/_windows.py
@@ -22,6 +22,7 @@
 
 
 class _ProactorEventLoop(asyncio.ProactorEventLoop):
+
 	"""Proactor based event loop."""
 
 	def __init__(self):
@@ -166,6 +167,7 @@ def run(self):
 
 @with_logger
 class _EventPoller(QtCore.QObject):
+
 	"""Polling of events in separate thread."""
 
 	sig_events = QtCore.Signal(list)
diff --git a/tests/test_qeventloop.py b/tests/test_qeventloop.py
index 3adafc7..a7098c7 100644
--- a/tests/test_qeventloop.py
+++ b/tests/test_qeventloop.py
@@ -88,6 +88,7 @@ def executor(request):
 
 
 class TestCanRunTasksInExecutor:
+
 	"""
 	Test Cases Concerning running jobs in Executors.
 
@@ -399,6 +400,7 @@ def can_read():
 
 	assert got_msg is None, 'Should not have received a read notification'
 
+
 def test_remove_reader_after_closing(loop, sock_pair):
 	"""Verify that we can remove a reader callback from an event loop."""
 	client_sock, srv_sock = sock_pair
@@ -407,6 +409,7 @@ def test_remove_reader_after_closing(loop, sock_pair):
 	loop.close()
 	loop.remove_reader(srv_sock.fileno())
 
+
 def test_remove_writer_after_closing(loop, sock_pair):
 	"""Verify that we can remove a reader callback from an event loop."""
 	client_sock, srv_sock = sock_pair
@@ -415,13 +418,15 @@ def test_remove_writer_after_closing(loop, sock_pair):
 	loop.close()
 	loop.remove_writer(client_sock.fileno())
 
+
 def test_add_reader_after_closing(loop, sock_pair):
 	"""Verify that we can remove a reader callback from an event loop."""
 	client_sock, srv_sock = sock_pair
 
 	loop.close()
 	with pytest.raises(RuntimeError):
-		loop.add_reader(srv_sock.fileno(), lambda:None)
+		loop.add_reader(srv_sock.fileno(), lambda: None)
+
 
 def test_add_writer_after_closing(loop, sock_pair):
 	"""Verify that we can remove a reader callback from an event loop."""
@@ -429,7 +434,8 @@ def test_add_writer_after_closing(loop, sock_pair):
 
 	loop.close()
 	with pytest.raises(RuntimeError):
-		loop.add_writer(client_sock.fileno(), lambda:None)
+		loop.add_writer(client_sock.fileno(), lambda: None)
+
 
 def test_can_add_writer(loop, sock_pair):
 	"""Verify that we can add a writer callback to an event loop."""
diff --git a/tox.ini b/tox.ini
index ca5d531..64bd23f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,5 +46,5 @@ commands=py.test --cov quamash
 
 [flake8]
 max-complexity=15
-ignore=D1,W191,E501,E402,E704,E701
+ignore=D1,W191,E501,E402,E704,E701,D211
 exclude=build,.git,__pycache__,wheelhouse,htmlcov,dist,.cache,*.egg-info,appveyor