diff -r c4d22fabf017 -r a7332a53e6dc setup.py
--- a/setup.py	Sun Mar 11 11:40:48 2018 +0100
+++ b/setup.py	Mon Mar 26 10:38:06 2018 +0200
@@ -62,6 +62,7 @@
       extras_require=dict(test=tests_require),
       install_requires=[
           'setuptools',
+          'sphinx_rtd_theme'
           # -*- Extra requirements: -*-
       ],
       entry_points={})