diff --git a/server/tools/protobuild/cs_proto.proto b/server/tools/protobuild/cs_proto.proto
index 5a4a151b..80afdb78 100755
--- a/server/tools/protobuild/cs_proto.proto
+++ b/server/tools/protobuild/cs_proto.proto
@@ -60,6 +60,7 @@ message CMPing
 message SMPing
 {
     optional int32 param1 = 1;
+    optional int32 source = 2 [default = 0]; //0:tcp 1:udp
 }
 
 //kcp握手