diff --git a/README.rst b/README.rst
index 125fb1c5..86bafa1a 100644
--- a/README.rst
+++ b/README.rst
@@ -117,6 +117,12 @@ Installation
 
     pip install -U python-dotenv
 
+For commandline support, use the `cli` option during installation:
+
+::
+
+    pip install -U "python-dotenv[cli]"
+
 Command-line interface
 ======================
 
diff --git a/setup.py b/setup.py
index de55f70d..ad0b447a 100644
--- a/setup.py
+++ b/setup.py
@@ -19,9 +19,9 @@
     keywords=['environment variables', 'deployments', 'settings', 'env', 'dotenv',
               'configurations', 'python'],
     packages=['dotenv'],
-    install_requires=[
-        'click>=5.0',
-    ],
+    extras_require={
+        'cli': ['click>=5.0', ],
+    },
     entry_points='''
         [console_scripts]
         dotenv=dotenv:cli.cli
@@ -49,6 +49,7 @@
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',