diff --git a/doc/POST_INSTALL.md b/doc/POST_INSTALL.md
index cc05dbd..bdf769f 100644
--- a/doc/POST_INSTALL.md
+++ b/doc/POST_INSTALL.md
@@ -2,11 +2,11 @@ If your server name is identical to the domain on which synapse is installed, an
 
 If not, you may need to put the following line in the dns configuration:
 
-_matrix._tcp.$domain. 3600    IN      SRV     10 0 $port_synapse_tls $domain.
+_matrix._tcp.__DOMAIN__. 3600    IN      SRV     10 0 __PORT_SYNAPSE_TLS__ __DOMAIN__.
 
 For more details, see : https://github.com/element-hq/synapse#setting-up-federation
 
-You also need to open the TCP port $port_synapse_tls on your ISP box if it's not automatically done.
+You also need to open the TCP port __PORT_SYNAPSE_TLS__ on your ISP box if it's not automatically done.
 
 Your synapse server also implements a turnserver (for VoIP), to have this fully functional please read the 'Turnserver' section in the README available here: https://github.com/YunoHost-Apps/synapse_ynh .