Update settings.md

diff --git a/docs/markdown/recursor/settings.md b/docs/markdown/recursor/settings.md
index 7b34ead818ff830b5115e24142ea0af8dd68a192..e95f24ce314aceb5b4862064e4dedfd55423924c 100644 (file)
--- a/docs/markdown/recursor/settings.md
+++ b/docs/markdown/recursor/settings.md
@@ -74,7 +74,8 @@ are doing. See ["PowerDNS Metrics"](../common/logging.md#sending-to-carbongraphi
 * Available since: 3.5.3
 
 If set to an IP or IPv6 address, will send all available metrics to this server
-via the carbon protocol, which is used by graphite and metronome. See
+via the carbon protocol, which is used by graphite and metronome.  You may specify 
+an alternate port by appending :port, ex: 127.0.0.1:2004. See
 ["PowerDNS Metrics"](../common/logging.md#sending-to-carbongraphitemetronome).
 
 ## `carbon-interval`