diff --git a/src/MultiPlayer/mpmessages.hxx b/src/MultiPlayer/mpmessages.hxx
index a00fbbf..c1382af 100644
--- a/src/MultiPlayer/mpmessages.hxx
+++ b/src/MultiPlayer/mpmessages.hxx
@@ -108,6 +108,9 @@ struct T_PositionMsg {
     // angular acceleration wrt the earth centered frame measured in
     // the earth centered frame
     xdr_data_t angularAccel[3];
+    //zhongjin add
+    xdr_data_t jwhtext[4];
+
     // Padding. The alignment is 8 bytes on x86_64 because there are
     // 8-byte types in the message, so the size should be explicitly
     // rounded out to a multiple of 8. Of course, it's a bad idea to