diff --git a/docs/requirements.txt b/docs/requirements.txt
index 46b77444..7b714032 100755
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -6,3 +6,4 @@ sphinx-autobuild
 recommonmark
 sphinx_markdown_tables
 sphinxcontrib-wavedrom
+sphinx_rtd_theme