diff --git a/lib_xua/src/core/clocking/apppll.xc b/lib_xua/src/core/clocking/apppll.xc
index 8171092d..43914994 100644
--- a/lib_xua/src/core/clocking/apppll.xc
+++ b/lib_xua/src/core/clocking/apppll.xc
@@ -1,3 +1,5 @@
+// Copyright 2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
 #include <print.h>
 #include <platform.h>
 #include "xua.h"
diff --git a/lib_xua/src/core/clocking/fractions_80_top.h b/lib_xua/src/core/clocking/fractions_80_top.h
index 3481797f..2b0eba43 100644
--- a/lib_xua/src/core/clocking/fractions_80_top.h
+++ b/lib_xua/src/core/clocking/fractions_80_top.h
@@ -1,3 +1,6 @@
+// Copyright 2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
 // Header file listing fraction options searched
 // These values to go in the bottom 16 bits of the secondary PLL fractional-n divider register.
 short frac_values_80[391] = {