diff --git a/conf/vars.xml b/conf/vars.xml
index de0ed6b542..88c39cefa1 100644
--- a/conf/vars.xml
+++ b/conf/vars.xml
@@ -183,7 +183,7 @@
   <X-PRE-PROCESS cmd="set" data="default_provider_contact=5000"/>
 
   <!--
-      SIP and TLS settings.
+      SIP and TLS settings. http://wiki.freeswitch.org/wiki/Tls
   -->
   <X-PRE-PROCESS cmd="set" data="sip_tls_version=tlsv1"/>