diff --git a/man/netlibre.8 b/man/netlibre.8
index eb46e4a..aeb5b14 100644
--- a/man/netlibre.8
+++ b/man/netlibre.8
@@ -60,6 +60,18 @@ The deployment was done on two machines:
 (custom)
 .Nd the dns manager daemon
 .br
+.Nm mailer
+(custom)
+.Nd a simple executable to send template mails
+.br
+.Nm watchdog scripts
+(custom)
+.Nd to sync directories between primary and secondary NS
+.br
+.Nm smtp server
+(such as OpenSMTPd)
+.Nd to send registration and password recovery emails
+.br
 .Nm inotifywait
 .Nd wait for changes on the file system (used for domain sync)
 .br
@@ -81,12 +93,16 @@ This tool prevents powerdns to start since it works on the same port (53).
 .SUBTITLE run powerdns
 .cmd ubuntu $ systemctl restart pdns
 .cmd alpine $ service pdns restart
+NOTE : powerdns documentation on alpine is basically just a lot of SQL files in /usr/share/doc/pdns/
 
 .SUBTITLE install inotify-tools
 .cmd ubuntu $ apt install inotify-tools
 .cmd alpine $ apk add inotify-tools
 
-NOTE : powerdns documentation on alpine is basically just a lot of SQL files in /usr/share/doc/pdns/
+.SUBTITLE install an smtp server
+.cmd alpine $ apk add opensmtpd
+Actual configuration of the smtp (+SPF, DKIM, etc.) should be taken care of.
+An example of OpenSMTPd configuration is in this repository (infrastructure-doc).
 
 .TITLE TESTING TOOLS
 .SUBTITLE testing port 53
@@ -104,6 +120,7 @@ NOTE : powerdns documentation on alpine is basically just a lot of SQL files in
 Well, there isn't much configuration since both powerdns instances just run "as is" with the bind backend that is filled on-the-fly.
 
 .SUBTITLE watchdogs in a few words
+A watchdog is (in this context) a command watching a directory.
 These commands should run either on the primary or secondary name server.
 They are distributed with
 .cmdname dnsmanagerd
@@ -129,4 +146,7 @@ directly?
 .\" writes bind9 files in a temporary directory before being sent to /var/powerdns.
 .\" This enables to first load old zones (they are still served as before) then to update them on-the-fly once the users make changes on the new website.
 
+TODO: expand the documentation
+
 .TITLE LIMITATIONS
+TODO: expand the documentation