diff --git a/setup.cfg b/setup.cfg
index 2b9124c06..677247955 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,6 +3,7 @@ zip_ok = false
 
 [aliases]
 dev = develop easy_install letsencrypt[testing]
+docs = develop easy_install letsencrypt[docs]
 
 [nosetests]
 nocapture=1
diff --git a/setup.py b/setup.py
index 93e22b4d9..a2a13fecf 100755
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,10 @@ install_requires = [
     'requests',
 ]
 
+docs_extras = [
+    'Sphinx',
+]
+
 testing_extras = [
     'coverage',
     'nose',
@@ -36,6 +40,7 @@ setup(
     tests_require=install_requires,
     test_suite='letsencrypt',
     extras_require={
+        'docs': docs_extras,
         'testing': testing_extras,
     },
     entry_points={