diff --git a/arch/avr/include/atmega/irq.h b/arch/avr/include/atmega/irq.h
index 6f1b6b97358..ab35caa004f 100644
--- a/arch/avr/include/atmega/irq.h
+++ b/arch/avr/include/atmega/irq.h
@@ -48,7 +48,7 @@
 #include <arch/avr/avr.h>
 
 /****************************************************************************
- * Definitions
+ * Pre-processor Definitions
  ****************************************************************************/
 
 /* The ATmega128 has 35 interrupt vectors including vector 0, the reset