diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..ea68e86
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,4 @@
+sphinx>=2.0.0,!=2.1.0 # BSD
+otcdocstheme # Apache-2.0
+# releasenotes
+reno>=3.1.0 # Apache-2.0
\ No newline at end of file