diff --git a/dns.c b/dns.c
index b2fe5e610b..efa999a348 100644
--- a/dns.c
+++ b/dns.c
@@ -23,6 +23,10 @@
  * \brief DNS Support for Asterisk
  *
  * \author Thorsten Lockert <tholo@trollphone.org>
+ *
+ * \par Reference
+ * - DNR SRV records http://www.ietf.org/rfc/rfc2782.txt
+ *
  */
 
 #include <sys/types.h>
diff --git a/enum.c b/enum.c
index 96e0702ebe..9304c2228d 100644
--- a/enum.c
+++ b/enum.c
@@ -35,6 +35,9 @@
  * - ENUM SIP: http://www.ietf.org/rfc/rfc3764.txt
  * - IANA ENUM Services: http://www.iana.org/assignments/enum-services
  *
+ * \par Possible improvement
+ * \todo Implement a caching mechanism for multile enum lookups
+ * - See http://bugs.digium.com/view.php?id=6739
  */
 
 #include <sys/types.h>