diff --git a/lib_xua/api/xua_conf_default.h b/lib_xua/api/xua_conf_default.h
index 17379e94..dd9287dc 100644
--- a/lib_xua/api/xua_conf_default.h
+++ b/lib_xua/api/xua_conf_default.h
@@ -202,6 +202,9 @@
 #define XUA_I2S_N_BITS (32)
 #endif
 
+#if (XUA_I2S_N_BITS != 16) && (XUA_I2S_N_BITS != 24) && (XUA_I2S_N_BITS != 32)
+#error Unsupported value for XUA_I2S_N_BITS (only values 16/24/32 supported)
+#endif
 
 /**
  * @brief Max supported sample frequency for device (Hz). Default: 192000
diff --git a/lib_xua/src/core/warnings.xc b/lib_xua/src/core/warnings.xc
index 16ffc49e..1a8fadd5 100644
--- a/lib_xua/src/core/warnings.xc
+++ b/lib_xua/src/core/warnings.xc
@@ -1,8 +1,8 @@
-// Copyright 2013-2021 XMOS LIMITED.
+// Copyright 2013-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 
 /*
-Warnings relating to configuration defines located in this XC source file rather than the devicedefines.h header file in order to avoid multiple warnings being issued when the devicedefines.h header file is included in multiple files.
+Warnings relating to configuration defines located in this XC source file rather than the xua_conf.h header file in order to avoid multiple warnings being issued when the xua_conf.h header file is included in multiple files.
 */
 
 #include "xua_conf_full.h"