diff --git a/camlibs/canon/usb.c b/camlibs/canon/usb.c
index c8b7e94ff..7be53d507 100644
--- a/camlibs/canon/usb.c
+++ b/camlibs/canon/usb.c
@@ -472,6 +472,8 @@ canon_usb_init (Camera *camera, GPContext *context)
 
         GP_DEBUG ("Initializing the (USB) camera.");
 
+	/* FIXME: check these ... they seem necessary actually, but might
+	 * cause issues on USB 3 or RaspBerry Pi */
 	gp_port_usb_clear_halt (camera->port, GP_PORT_USB_ENDPOINT_IN);
 	gp_port_usb_clear_halt (camera->port, GP_PORT_USB_ENDPOINT_OUT);
 	gp_port_usb_clear_halt (camera->port, GP_PORT_USB_ENDPOINT_INT);