diff --git a/.travis.yml b/.travis.yml
index 7296f6f..6c02fd7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ python:
 install:
   - "pip install -r requirements.txt"
 script:
+  - "pep8  --ignore E501 i3pystatus tests"
   - "PYTHONPATH=. py.test"       # run unit tests
   - "python setup.py install"    # test install
   - "sphinx-build -W docs html"     # test building docs
diff --git a/html/_static/up-pressed.png b/html/_static/up-pressed.png
new file mode 100644
index 0000000..8bd587a
Binary files /dev/null and b/html/_static/up-pressed.png differ
diff --git a/requirements.txt b/requirements.txt
index 2592154..18de096 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ pytest>=2.5
 sphinx>=1.2
 colour>=0.0.5
 mock>=1.0
+pep8>=1.5