[2155] add notes for SIG(0)

diff --git a/src/bin/auth/auth_srv.cc b/src/bin/auth/auth_srv.cc
index a2973018067db2e785ea7ee9619dccb94d8bbc43..8cc4a2d66bed4be914da1056249dd2c7cb6ba434 100644 (file)
--- a/src/bin/auth/auth_srv.cc
+++ b/src/bin/auth/auth_srv.cc
@@ -564,7 +564,9 @@ AuthSrv::processMessage(const IOMessage& io_message, Message& message,
         tsig_error = tsig_context->verify(tsig_record, io_message.getData(),
                                           io_message.getDataSize());
         // statistics: check TSIG attributes
-        // SIG(0) is currently not implemented in Auth
+        // SIG(0) is currently not implemented in Auth, but it is implemented
+        // in BIND 9. At the point we support it, the code to check if the
+        // signature is valid would be around here.
         stats_attrs.setQuerySig(true, false,
                                 tsig_error == TSIGError::NOERROR());
     }