diff --git a/machine.h b/machine.h
index 20e8070..1a49363 100644
--- a/machine.h
+++ b/machine.h
@@ -29,6 +29,7 @@ typedef struct {
 
 
 #define LED_27 1
+// SYSTEM LED
 #define LED_28_SYS 2
 #define LED_29 4
 
diff --git a/rtl837x_leds.c b/rtl837x_leds.c
index f92360b..e344cd4 100644
--- a/rtl837x_leds.c
+++ b/rtl837x_leds.c
@@ -190,6 +190,7 @@ void leds_setup(void) __banked
 	else
 		reg_bit_clear(RTL837X_PIN_MUX_0, 27);
 
+	// SYSTEM LED
 	if (machine.high_leds.mux & LED_28_SYS)
 		reg_bit_set(RTL837X_PIN_MUX_0, 28);
 	else
@@ -205,6 +206,7 @@ void leds_setup(void) __banked
 	else
 		reg_bit_clear(RTL837X_REG_LED_GLB_IO_EN, 27);
 
+	// SYSTEM LED
 	if (machine.high_leds.enable & LED_28_SYS)
 		reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 28);
 	else