diff -r bb64b8847749 -r d967fef53cb4 data/dictionary.xml
--- a/data/dictionary.xml	Mon Aug 12 20:19:21 2013 +0200
+++ b/data/dictionary.xml	Mon Aug 12 21:44:45 2013 +0200
@@ -192,7 +192,8 @@
 		<explanation language="en">
 			<text>
 				a text-based client-server protocol for sending e-mail messages
-				uses TCP and standard port is 25 (STARTTLS or unencrypted) or 465 (SSL/TLS) or 587 (STARTTLS or unencrypted for Message Submission – RFC 6409)
+				uses TCP and standard port is 25 (STARTTLS or unencrypted) or 465 (SSL/TLS) or 587 (STARTTLS or unencrypted for Message Submission – RFC 6409);
+				is defined in RFC 5321
 			</text>
 		</explanation>
 		<tag>computer</tag>