backup before sync

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac311@2841 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/dns/edns.h

@@ -38,6 +38,8 @@ class Rcode;
 
 /// \brief A pointer-like type pointing to an \c EDNS object.
 typedef boost::shared_ptr<EDNS> EDNSPtr;
+
+/// \brief A pointer-like type pointing to an immutable \c EDNS object.
 typedef boost::shared_ptr<const EDNS> ConstEDNSPtr;
 
 /// Document why this is separated from \c Message.