diff --git a/setup.py b/setup.py
index 61b5ef3..975a15e 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,7 @@ setup(
     packages=find_packages(),
     install_requires=[
         'shapeways==1.0.0',
+        'docopt==0.6.2',
     ],
     scripts=[
         './bin/swuploader',