diff --git a/docs/reference-configuration.adoc b/docs/reference-configuration.adoc
index 0d691617..d71e8589 100644
--- a/docs/reference-configuration.adoc
+++ b/docs/reference-configuration.adoc
@@ -678,7 +678,8 @@ configuration, and may be omitted for most of the situations.
 
 | `role`
 | no
-| `standard` (default) or `fallback`.
+| `primary` (default), `secondary` or `fallback`.
+First it makes the requests to the upstreams with role `primary`, then if none are available to upstreams with role `secondary`.
 Fallback role mean that the upstream is used only after other upstreams failed or didn't return quorum
 
 | `chain`