diff --git a/core/driver/socketcan/socket_can.cpp b/core/driver/socketcan/socket_can.cpp
index 9a15bab..454469e 100644
--- a/core/driver/socketcan/socket_can.cpp
+++ b/core/driver/socketcan/socket_can.cpp
@@ -374,6 +374,7 @@ void SocketCan::socketCanReadThreadLoop() {
     }
 
     if (canframe.can_id & CAN_ERR_FLAG) {
+      // /usr/include/linux/can/error.h
       logger->error("rx can-bus error event {:x},{}", canframe.can_id, StringUtils().bytesToString(canframe.data, canframe.len));
     } else {
       // logger->info("TX:{} {} {}", canframe.can_id, canframe.__res0, canframe.__res1);