6 files changed, 24 insertions, 0 deletions
diff --git a/src/ulib/assert.c b/src/ulib/assert.c
index ca2da84..c60643a 100644
--- a/src/ulib/assert.c
+++ b/src/ulib/assert.c
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
 #include "stdio.h"
 #include "stdlib.h"
 
diff --git a/src/ulib/cxx.cc b/src/ulib/cxx.cc
index 6c892ab..d8f510d 100644
--- a/src/ulib/cxx.cc
+++ b/src/ulib/cxx.cc
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
 #include "ulib/stdlib.h"
 
 void *operator new(unsigned long n)
diff --git a/src/ulib/iostream.cpp b/src/ulib/iostream.cpp
index d5394f9..4d721c1 100644
--- a/src/ulib/iostream.cpp
+++ b/src/ulib/iostream.cpp
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
 #include "ulib/iostream"
 
 namespace std
diff --git a/src/ulib/stdio.c b/src/ulib/stdio.c
index f8e7a9a..e81f69a 100644
--- a/src/ulib/stdio.c
+++ b/src/ulib/stdio.c
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
 #include "ulib/stdio.h"
 #include "ulib/string.h"
 #include "ulib/stdlib.h"
diff --git a/src/ulib/stdlib.c b/src/ulib/stdlib.c
index 89d5a08..8b22b6f 100644
--- a/src/ulib/stdlib.c
+++ b/src/ulib/stdlib.c
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
 #include "ulib/stdlib.h"
 #include "ulib/string.h"
 #include "ulib/ctypes.h"
diff --git a/src/ulib/string.c b/src/ulib/string.c
index 5fc1cbd..c3dbe9a 100644
--- a/src/ulib/string.c
+++ b/src/ulib/string.c
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
 #include "ulib/string.h"
 #include "ulib/stdlib.h"