diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..8d56e6a
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,5 @@
+sphinx>=2.0.0,!=2.1.0 # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
+
+# releasenotes
+reno>=3.1.0 # Apache-2.0