diff --git a/doc/requirements.txt b/doc/requirements.txt
index 012efb2..67530ff 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -4,3 +4,4 @@
 sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
+sphinxcontrib-apidoc>=0.2.0  # BSD