diff --git a/ctrl/mailproc.cfg b/ctrl/mailproc.cfg
index 22665e1bf2be12faca565492457ae8979ef62e70..4856c10706870c47e72b6307de42e1a02185ffbf 100644
--- a/ctrl/mailproc.cfg
+++ b/ctrl/mailproc.cfg
@@ -30,6 +30,8 @@
 ;
 ;     %h = sending SMTP server's host name
 ;     %i = sending SMTP server's IP address
+;     %s = sender's name or e-mail address (e.g. "Rob Swindell")
+;     %a = sender's e-mail address (e.g. "rob@somehost.com")
 ;
 ;     %u = authenticated user number (0=unauthenticated)
 ;
@@ -138,6 +140,9 @@
 ; The sending SMTP server's IP addrses (%i) is available to JavaScript modules
 ; using the 'client.ip_address' property.
 ;
+; The sender's name (%s) and e-mail address (%a) are available to JavaScript
+; modules using the 'sender_name' and 'sender_address' properties.
+;
 ; See the example JavaScript mail processor (mailproc_example.js) in your
 ; Synchronet EXEC directory for more details.
 ;