diff --git a/libbeat/docs/dashboardsconfig.asciidoc b/libbeat/docs/dashboardsconfig.asciidoc
index 03a24c41c5d2..3dd255009a50 100644
--- a/libbeat/docs/dashboardsconfig.asciidoc
+++ b/libbeat/docs/dashboardsconfig.asciidoc
@@ -92,6 +92,8 @@ is `".kibana"`
 The Elasticsearch index name. This setting overwrites the index name defined
 in the dashboards and index pattern. Example: `"testbeat-*"`
 
+NOTE: This setting only works for Kibana 6.0 and newer.
+
 [float]
 ==== `setup.dashboards.always_kibana`