From c4bdbc2bd2a1c90467de4d81eb3bf5ee7f6f8fb9 Mon Sep 17 00:00:00 2001
From: Silke <silke@slxh.eu>
Date: Sat, 14 Apr 2018 14:36:11 +0200
Subject: [PATCH] Clarify that SRV may not point to a CNAME

Signed-off-by: Silke Hofstra <silke@slxh.eu>
---
 README.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/README.rst b/README.rst
index 8812cc1b4f..28fbe45de6 100644
--- a/README.rst
+++ b/README.rst
@@ -614,6 +614,9 @@ should have the format ``_matrix._tcp.<yourdomain.com> <ttl> IN SRV 10 0 <port>
     $ dig -t srv _matrix._tcp.example.com
     _matrix._tcp.example.com. 3600    IN      SRV     10 0 8448 synapse.example.com.
 
+Note that the server hostname cannot be an alias (CNAME record): it has to point
+directly to the server hosting the synapse instance.
+
 You can then configure your homeserver to use ``<yourdomain.com>`` as the domain in
 its user-ids, by setting ``server_name``::