diff --git a/docs/shared/requirements.txt b/docs/shared/requirements.txt
index 74c05d6d53..23c6dbfdfd 100644
--- a/docs/shared/requirements.txt
+++ b/docs/shared/requirements.txt
@@ -34,6 +34,7 @@ glob2==0.3
 lxml==3.0.1
 mako==0.7.3
 Markdown==2.2.1
+mock==1.0.1
 networkx==1.7
 nltk==2.0.4
 oauthlib==0.5.1