diff --git a/core/Tron.proto b/core/Tron.proto
index d70672297..a2bc17193 100644
--- a/core/Tron.proto
+++ b/core/Tron.proto
@@ -325,7 +325,7 @@ message Transaction {
     bytes ref_block_hash = 4;
     int64 expiration = 8;
     repeated authority auths = 9;
-    // data not used
+    // transaction note
     bytes data = 10;
     //only support size = 1,  repeated list here for extension
     repeated Contract contract = 11;
@@ -678,4 +678,4 @@ message NodeInfo {
       string stackTrace = 7;
     }
   }
-}
\ No newline at end of file
+}