diff --git a/portable/GCC/ARM_CM23_NTZ/non_secure/port.c b/portable/GCC/ARM_CM23_NTZ/non_secure/port.c
index 8cd327dde..3f39bc3b1 100644
--- a/portable/GCC/ARM_CM23_NTZ/non_secure/port.c
+++ b/portable/GCC/ARM_CM23_NTZ/non_secure/port.c
@@ -22,6 +22,7 @@
  * http://www.FreeRTOS.org
  * http://aws.amazon.com/freertos
  *
+ * 1 tab == 4 spaces!
  */
 
 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining