diff --git a/index.md b/index.md
index 70d505a..000d118 100644
--- a/index.md
+++ b/index.md
@@ -34,6 +34,7 @@ Setup [nginx](https://www.nginx.com/) webserver. Nginx is an open source reverse
   * [nginx_send_timeout](#nginx_send_timeout)
   * [nginx_server_names_hash_bucket_size](#nginx_server_names_hash_bucket_size)
   * [nginx_tls_certificates](#nginx_tls_certificates)
+  * [nginx_tls_certificates_extra](#nginx_tls_certificates_extra)
   * [nginx_tls_ciphers](#nginx_tls_ciphers)
   * [nginx_tls_dhparam_file](#nginx_tls_dhparam_file)
   * [nginx_tls_dhparam_size](#nginx_tls_dhparam_size)
@@ -331,6 +332,14 @@ nginx_tls_certificates:
     mode: 0600
 ```
 
+### nginx_tls_certificates_extra
+
+#### Default value
+
+```YAML
+nginx_tls_certificates_extra: []
+```
+
 ### nginx_tls_ciphers
 
 #### Default value