diff --git a/plugins/fcrdns b/plugins/fcrdns
index fd5c564..f606a19 100644
--- a/plugins/fcrdns
+++ b/plugins/fcrdns
@@ -8,7 +8,8 @@ Forward Confirmed RDNS - http://en.wikipedia.org/wiki/FCrDNS
 
 Determine if the SMTP sender has matching forward and reverse DNS.
 
-Sets the connection note fcrdns.
+Adds the 'iprev' section to the Authentication-Results header when
+there's sufficient DNS (at least rDNS) to be meaningful.
 
 =head1 WHY IT WORKS