diff --git a/doc/en/_templates/globaltoc.html b/doc/en/_templates/globaltoc.html
index 30e9da61c..4522eb2de 100644
--- a/doc/en/_templates/globaltoc.html
+++ b/doc/en/_templates/globaltoc.html
@@ -21,3 +21,7 @@
   <hr>
   {{ toc }}
 {%- endif %}
+
+<hr>
+<a href="{{ pathto('genindex') }}">Index</a>
+<hr>
diff --git a/doc/en/conf.py b/doc/en/conf.py
index 1aa1f6b0a..71f63712e 100644
--- a/doc/en/conf.py
+++ b/doc/en/conf.py
@@ -208,7 +208,7 @@ html_sidebars = {
 html_domain_indices = True
 
 # If false, no index is generated.
-html_use_index = False
+html_use_index = True
 
 # If true, the index is split into individual pages for each letter.
 # html_split_index = False