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draft-ietf-add-resolver-info.md

@@ -117,9 +117,11 @@ Reputation:
    using the RESINFO RR type and QNAME of "resolver.arpa". In this case, a client has to contend
    with the risk that a resolver does not support RESINFO. The resolver might
    pass the query upstream, and then the client can receive a positive RESINFO response either
-   from a legitimate upstream DNS resolver or an attacker. If a client sees the RESINFO in the
-   Answer section, it can detect that the response is not provided by the resolver
-   and discards the response.
+   from a legitimate upstream DNS resolver or an attacker. The client in the DNS query MUST
+   set the Recursion Desired (RD) bit set to 0 to ensure the response is provided by the resolver. 
+   If the resolver does not support RESINFO, it will return an authoritative name error.
+   In addition, if a client sees the RESINFO in the Answer section, it can detect that 
+   the response is not provided by the resolver and discards the response.
 
 #  Format of the Resolver Information {#format}