From 502caabd15062a4d44a505d63ffd983056c69a82 Mon Sep 17 00:00:00 2001
From: Martin Monperrus <monperrus@users.noreply.github.com>
Date: Tue, 4 Feb 2020 15:39:29 +0000
Subject: [PATCH] doc: document upstream_selector

fix #66
---
 Readme.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Readme.md b/Readme.md
index 8447a44..30085b9 100644
--- a/Readme.md
+++ b/Readme.md
@@ -79,6 +79,17 @@ you can host DNS-over-HTTPS along with other HTTPS services.
 HTTP/2 with at least TLS v1.3 is recommended. OCSP stapling must be enabled,
 otherwise DNS recursion may happen.
 
+### Configuration file
+
+The main configuration file is `doh-client.conf`.
+
+**Server selectors.** If several upstream servers are set, one is selected according to `upstream_selector` for each request. With `upstream_selector = "random"`, a random upstream server will be chosen for each request.
+
+```toml
+# available selector: random (default) or weighted_round_robin or lvs_weighted_round_robin
+upstream_selector = "random"
+```
+
 ### Example configuration: Apache
 
     SSLProtocol TLSv1.2