diff --git a/protocol/userProxy.proto b/protocol/userProxy.proto
index aecd63ab73e89ccb172fb5ba8d1bb77eafcaa608..7503b54723426b8730c811d06037604a92cd2580 100644
--- a/protocol/userProxy.proto
+++ b/protocol/userProxy.proto
@@ -401,5 +401,5 @@ message CpUpgrade {
     User user1 = 1;
     User user2 = 2;
     uint32 cp_level = 3;
-    string content = 4;
+    string group_id = 4;
 }
\ No newline at end of file