diff --git a/requirements.txt b/requirements.txt
index 49b322eb9..df8087d17 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,5 @@
 # Code tabs for GDScript/C#
 sphinx-tabs
+
+# Full-page search UI for RTD: https://readthedocs-sphinx-search.readthedocs.io
+git+https://github.com/readthedocs/readthedocs-sphinx-search@master