diff --git a/docs/docs_requirements.txt b/docs/docs_requirements.txt
index d4cb2f6..49ceff8 100644
--- a/docs/docs_requirements.txt
+++ b/docs/docs_requirements.txt
@@ -1,3 +1,4 @@
 CherryPy>=3.0.0
 PyYAML
 Mako
+mock