diff --git a/requirements.txt b/requirements.txt
index 57e8c54..db3eed3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,5 @@
 
 pbr>=1.6
 PyYAML>=3.1.0
+docutils
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2