diff --git a/grbl/limits.c b/grbl/limits.c
index b226ecf3..3bd1c44b 100644
--- a/grbl/limits.c
+++ b/grbl/limits.c
@@ -69,11 +69,9 @@ void limits_init()
 		GPIO_EXTILineConfig(GPIO_LIMIT_PORT, Z_LIMIT_BIT);
 
 		EXTI_InitTypeDef EXTI_InitStructure;
-		EXTI_InitStructure.EXTI_Line = LIMIT_MASK;
-		//Interrupt mode, optional values for the interrupt EXTI_Mode_Interrupt and event EXTI_Mode_Event.
-		EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
-		//Trigger mode, can be a falling edge trigger EXTI_Trigger_Falling, the rising edge triggered EXTI_Trigger_Rising, or any level (rising edge and falling edge trigger EXTI_Trigger_Rising_Falling)
-		EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
+		EXTI_InitStructure.EXTI_Line = LIMIT_MASK;    //
+		EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //Interrupt mode, optional values for the interrupt EXTI_Mode_Interrupt and event EXTI_Mode_Event.
+		EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //Trigger mode, can be a falling edge trigger EXTI_Trigger_Falling, the rising edge triggered EXTI_Trigger_Rising, or any level (rising edge and falling edge trigger EXTI_Trigger_Rising_Falling)
 		EXTI_InitStructure.EXTI_LineCmd = ENABLE;
 		EXTI_Init(&EXTI_InitStructure);