diff --git a/docs/requirements.txt b/docs/requirements.txt
index 07bfeb4..46d8309 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,7 @@
 # File: docs/requirements.txt
 
 sphinx>=5
+recommonmark
 myst-nb
 sphinx_rtd_theme
 readthedocs-sphinx-search