--- a/src/cf.data.pre
+++ b/src/cf.data.pre
@@ -2728,6 +2728,19 @@ DOC_START
 			If 'sslkey' is not specified 'sslcert' is assumed to
 			reference a combined file containing both the
 			certificate and the key.
+
+	Notes:
+	
+	On Debian/Ubuntu systems a default snakeoil certificate is
+    available in /etc/ss and users can set:
+
+		cert=/etc/ssl/certs/ssl-cert-snakeoil.pem
+
+	and
+
+		key=/etc/ssl/private/ssl-cert-snakeoil.key
+
+	for testing.
 	
 	sslversion=1|2|3|4|5|6
 			The SSL version to use when connecting to this peer
