diff --git a/dns_config.md b/dns_config.md
index 0d33e10d..593810cd 100644
--- a/dns_config.md
+++ b/dns_config.md
@@ -42,6 +42,8 @@ Replace:
  * `111.222.333.444`: [IPv4](http://ip.yunohost.org/).
  * `2001:AABB:CCDD:EEFF:1122:3344:5566:7788`: [IPv6](http://ip6.yunohost.org/).
 
+DNS lines for subdomains, XMPP and email does not works without a redirection from the domain name to the IP address (one line is enough) because they depends on it.
+
 <div class="alert alert-info"><b>To begin:</b> lines with "(Minimal)" are the minimal required DNS entries to make works redirection from the domain name to the IP adress, XMPP and email.</div>
 
 <div class="alert alert-warning"><b>Warning:</b> <b>@</b> is the default domain name currently defined, some registrar (like OVH) does not accept it, so replace @ by your domain name (domain.tld**.**) with a dot at the end.</div>