diff --git a/doc/09-object-types.md b/doc/09-object-types.md
index 67735e986..5c802a946 100644
--- a/doc/09-object-types.md
+++ b/doc/09-object-types.md
@@ -1211,7 +1211,7 @@ Configuration Attributes:
   --------------------------|-----------------------|----------------------------------
   host                      | String                | **Required.** Elasticsearch host address. Defaults to `127.0.0.1`.
   port                      | Number                | **Required.** Elasticsearch port. Defaults to `9200`.
-  index                     | String                | **Required.** Elasticsearch index name. Defaults to `icinga2`.
+  index                     | String                | **Required.** Prefix for the index names. Defaults to `icinga2`.
   enable\_send\_perfdata    | Boolean               | **Optional.** Send parsed performance data metrics for check results. Defaults to `false`.
   flush\_interval           | Duration              | **Optional.** How long to buffer data points before transferring to Elasticsearch. Defaults to `10s`.
   flush\_threshold          | Number                | **Optional.** How many data points to buffer before forcing a transfer to Elasticsearch.  Defaults to `1024`.