diff --git a/docs/requirements.txt b/docs/requirements.txt
index 188f51e62d..75f092707b 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1 +1,2 @@
-breathe
\ No newline at end of file
+breathe
+sphinx-rtd-theme
\ No newline at end of file