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-rw-r--r--src/user/echo.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/user/echo.cc b/src/user/echo.cc
index ff4b8be..cc9dc2a 100644
--- a/src/user/echo.cc
+++ b/src/user/echo.cc
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
#include "user/user.h"
#include "ulib/stdio.h"
#include "ulib/string.h"