1 files changed, 8 insertions, 4 deletions

diff --git a/draft-schanzen-gns.xml b/draft-schanzen-gns.xml
index 66e3e05..0db3206 100644
--- a/draft-schanzen-gns.xml
+++ b/draft-schanzen-gns.xml
@@ -882,11 +882,15 @@ zTLD := zkl[126..129].zkl[63..125].zkl[0..62]
      <name>Zone Delegation Records</name>
      <t>
        This section defines the initial set of zone delegation record types.
-       Any implementation MUST support all zone types defined here and
+       Any implementation SHOULD support all zone types defined here and
        MAY support any number of additional delegation records defined in
-       the GNU Name System Record Types registry <xref target="gana"/>.
-       Zone delegation records MUST NOT be stored and published under the
-       empty label.
+       the GNU Name System Record Types registry (see <xref target="gana"/>).
+       Not supporting some zone types MAY result in resolution failures. This
+       MAY BE a valid choice if some zone delegation record types have been
+       determined to be cryptographically insecure, or if an application has
+       reasons to not support delegation to DNS for reasons such as complexity
+       or security.  Zone delegation records MUST NOT be stored and published
+       under the empty label.
      </t>
      <section anchor="gnsrecords_pkey" numbered="true" toc="default">
        <name>PKEY</name>