diff --git a/docs/conf.py b/docs/conf.py
index e17edfc59..422f12b45 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -35,6 +35,7 @@
     "sphinx.ext.todo",
     "sphinx.ext.coverage",
     "sphinx.ext.viewcode",
+    "sphinx_search.extension",
 ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/docs/requirements.in b/docs/requirements.in
index 82133027c..1967cde37 100644
--- a/docs/requirements.in
+++ b/docs/requirements.in
@@ -1,2 +1,3 @@
+readthedocs-sphinx-search
 sphinx
 sphinx_rtd_theme
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 8a97d9c4e..34d07e5f4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -28,6 +28,8 @@ packaging==23.2
     # via sphinx
 pygments==2.16.1
     # via sphinx
+readthedocs-sphinx-search==0.3.1
+    # via -r requirements.in
 requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0