diff --git a/docs/requirements.txt b/docs/requirements.txt
index a42efae..322d350 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,3 +2,4 @@ sphinx==3.4.3
 sphinx_rtd_theme==0.5.1
 readthedocs-sphinx-search==0.1.0
 sphinx_markdown_tables==0.0.15
+recommonmark==0.7.1