diff --git a/tinyusb/device/dcd.h b/tinyusb/device/dcd.h
index 500cb8b8d..fb9d992fb 100644
--- a/tinyusb/device/dcd.h
+++ b/tinyusb/device/dcd.h
@@ -59,14 +59,15 @@ typedef enum
 }usbd_bus_event_type_t;
 
 /*------------------------------------------------------------------*/
-/* Controller API
+/* Device API (Weak is optional)
  *------------------------------------------------------------------*/
 bool dcd_init             (uint8_t rhport);
-void dcd_connect          (uint8_t rhport);
-void dcd_disconnect       (uint8_t rhport);
 void dcd_set_address      (uint8_t rhport, uint8_t dev_addr);
 void dcd_set_config       (uint8_t rhport, uint8_t config_num);
 
+void dcd_connect          (uint8_t rhport) ATTR_WEAK;
+void dcd_disconnect       (uint8_t rhport) ATTR_WEAK;
+
 /*------------------------------------------------------------------*/
 /* Event Function
  * Called by DCD to notify USBD