diff --git a/core/lexer.c b/core/lexer.c
index d6e5e66..a11a630 100644
--- a/core/lexer.c
+++ b/core/lexer.c
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause
+ */
+
 #include <errno.h>
 #include <stdbool.h>
 #include "cescal/lexer.h"
diff --git a/core/state.c b/core/state.c
index 912508c..dce1316 100644
--- a/core/state.c
+++ b/core/state.c
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause
+ */
+
 #include <stdint.h>
 #include <stddef.h>
 #include <fcntl.h>