diff --git a/radio/src/targets/horus/hal.h b/radio/src/targets/horus/hal.h
index 12b2a4630..dd8f6ec70 100644
--- a/radio/src/targets/horus/hal.h
+++ b/radio/src/targets/horus/hal.h
@@ -855,7 +855,7 @@
 #define INTMODULE_HEARTBEAT
 #define INTMODULE_HEARTBEAT_RCC_AHB1Periph      RCC_AHB1Periph_GPIOD
 #define INTMODULE_HEARTBEAT_GPIO                GPIOD
-#define INTMODULE_HEARTBEAT_GPIO_PIN            GPIO_Pin_12
+#define INTMODULE_HEARTBEAT_GPIO_PIN            GPIO_Pin_12   // PD.12
 #define INTMODULE_HEARTBEAT_EXTI_PortSource     EXTI_PortSourceGPIOD
 #define INTMODULE_HEARTBEAT_EXTI_PinSource      GPIO_PinSource12
 #define INTMODULE_HEARTBEAT_EXTI_LINE           EXTI_Line12