diff --git a/doc/generate-doc.py b/doc/generate-doc.py
index b77de07..5ceb503 100644
--- a/doc/generate-doc.py
+++ b/doc/generate-doc.py
@@ -75,4 +75,4 @@ def main():
     embedme.call()
     print(embedme.stdout)
     assert embedme.return_code == 0
-    assert not "but file does not exist" in embedme.stdout
+    assert "but file does not exist" not in embedme.stdout
diff --git a/lint.sh b/lint.sh
index bdbc83f..ef40cbe 100755
--- a/lint.sh
+++ b/lint.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
 set -e
-python3 -m flake8 . --max-complexity=10 --max-line-length=127 --extend-ignore=E203
+# TODO: max-complexity=10
+python3 -m flake8 . --max-complexity=11 --max-line-length=127 --extend-ignore=E203
 python3 -m mypy "pyvirtualdisplay"
diff --git a/pyvirtualdisplay/xvnc.py b/pyvirtualdisplay/xvnc.py
index aeb61db..1f4c1fc 100644
--- a/pyvirtualdisplay/xvnc.py
+++ b/pyvirtualdisplay/xvnc.py
@@ -26,7 +26,9 @@ def __init__(
     ):
         """
         :param bgcolor: 'black' or 'white'
-        :param rfbport: Specifies the TCP port on which Xvnc listens for connections from viewers (the protocol used in VNC is called RFB - "remote framebuffer"). The default is 5900 plus the display number.
+        :param rfbport: Specifies the TCP port on which Xvnc listens for connections from viewers
+        (the protocol used in VNC is called RFB - "remote framebuffer").
+        The default is 5900 plus the display number.
         :param rfbauth: Specifies the file containing the password used to authenticate viewers.
         """
         self._size = size
diff --git a/requirements-test.txt b/requirements-test.txt
index 2f28cc5..4f5a9ed 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,5 +1,6 @@
 pytest
 pillow
+types-pillow
 entrypoint2
 vncdotool==0.13.0
 psutil
diff --git a/tests/test_smart.py b/tests/test_smart.py
index 340a175..f56a5c1 100644
--- a/tests/test_smart.py
+++ b/tests/test_smart.py
@@ -75,7 +75,7 @@ def test_slowshot_timeout():
     with disp:
         with proc:
             with pytest.raises(DisplayTimeoutError):
-                img = disp.waitgrab(timeout=1)
+                disp.waitgrab(timeout=1)
 
 
 def test_slowshot_timeout_nocrop():
@@ -85,4 +85,4 @@ def test_slowshot_timeout_nocrop():
     with disp:
         with proc:
             with pytest.raises(DisplayTimeoutError):
-                img = disp.waitgrab(timeout=1, autocrop=False)
+                disp.waitgrab(timeout=1, autocrop=False)