diff --git a/index.md b/index.md
index 1f5f299..4b207ef 100644
--- a/index.md
+++ b/index.md
@@ -34,6 +34,7 @@ Deploy [Prometheus](https://prometheus.io/) monitoring system.
   * [prometheus_storage_retention_size](#prometheus_storage_retention_size)
   * [prometheus_targets](#prometheus_targets)
   * [prometheus_user](#prometheus_user)
+  * [prometheus_user_comment](#prometheus_user_comment)
   * [prometheus_user_home](#prometheus_user_home)
   * [prometheus_version](#prometheus_version)
   * [prometheus_web_basic_auth_users](#prometheus_web_basic_auth_users)
@@ -356,6 +357,14 @@ prometheus_targets:
 prometheus_user: prometheus_adm
 ```
 
+### prometheus_user_comment
+
+#### Default value
+
+```YAML
+prometheus_user_comment: Prometheus
+```
+
 ### prometheus_user_home
 
 #### Default value