diff --git a/ports/AVR/chcore.h b/ports/AVR/chcore.h
index b748ce1a9..6bb420a5d 100644
--- a/ports/AVR/chcore.h
+++ b/ports/AVR/chcore.h
@@ -28,8 +28,8 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 
-/*
- * Port-related configuration parameters.
+/**
+ * If enabled allows the idle thread to enter a low power mode.
  */
 #ifndef ENABLE_WFI_IDLE
 #define ENABLE_WFI_IDLE 0