diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9740ba3..625464e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,7 @@
 pipenv
 sphinx>=6.1.3
 sphinx-rtd-theme
+recommonmark
 numpydoc
 docutils>=0.19
 furo==2021.11.16