diff --git a/docs/requirements.txt b/docs/requirements.txt
index 80018969..e008b40e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,3 +3,4 @@
 -r ../requirements.txt
 sphinx>=1.7
 recommonmark==0.4.0
+sphinx-copybutton