diff --git a/setup.py b/setup.py
index 0e5cf67..124adaa 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ REQUIRED = [
 ]
 
 EXTRAS = {
-    'docs': ['sphinx', 'sphinx_rtd_theme'],
+    'docs': ['sphinx', 'sphinx_rtd_theme', 'sphinx_copybutton'],
     'test': ['pytest', 'pytest-cov'],
 }