diff --git a/docs/requirements.txt b/docs/requirements.txt
index c24d349..ac8af9a 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,3 +4,4 @@
 Sphinx==3.1.2
 sphinx-click==2.5.0
 sphinx-rtd-theme==0.5.0
+recommonmark==0.6.0