Document config-dir in the manpage better

Closes #4372

diff --git a/docs/manpages/pdns_recursor.1.md b/docs/manpages/pdns_recursor.1.md
index 66f1818124adec84d4d146d2c9ce59c2d628f099..ca69f40dc02533d5cef98b36b8764ff1766c2988 100644 (file)
--- a/docs/manpages/pdns_recursor.1.md
+++ b/docs/manpages/pdns_recursor.1.md
@@ -51,8 +51,9 @@ http://doc.powerdns.com/md/recursor/settings/
 :    Timeout in seconds when talking to TCP clients.
 
 --config-dir=*DIRECTORY*
-:    Location of configuration directory (recursor.conf), /etc/powerdns by
-     default.
+:    Location of configuration directory (recursor.conf), the default depends on
+     the SYSCONFDIR option at build-time, which is usually /etc/powerdns. The
+     default can be found with `pdns_recursor --config | grep ' config-dir='`.
 
 --daemon
 :    Operate as a daemon.