diff --git a/docs/reference/index.md b/docs/reference/index.md
index 088cd04b9..09472e1c6 100644
--- a/docs/reference/index.md
+++ b/docs/reference/index.md
@@ -1,6 +1,6 @@
 ---
 mapped_pages:
-  https://www.elastic.co/guide/en/elasticsearch/client/ruby-api/current/index.html
+  - https://www.elastic.co/guide/en/elasticsearch/client/ruby-api/current/index.html
   - https://www.elastic.co/guide/en/elasticsearch/client/ruby-api/current/ruby_client.html
 ---