From c2a0c1507b0db15a06773e321bd5c782bac54d39 Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Sun, 30 May 2021 23:44:29 +0700
Subject: [PATCH] add more comment

---
 src/portable/raspberrypi/rp2040/rp2040_usb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/portable/raspberrypi/rp2040/rp2040_usb.c b/src/portable/raspberrypi/rp2040/rp2040_usb.c
index 7718293e..a0263612 100644
--- a/src/portable/raspberrypi/rp2040/rp2040_usb.c
+++ b/src/portable/raspberrypi/rp2040/rp2040_usb.c
@@ -136,6 +136,7 @@ void _hw_endpoint_start_next_buffer(struct hw_endpoint *ep)
     // Special case with control status stage where PID is always DATA1
     if ( ep->transfer_size == 0 )
     {
+      // ZLP also toggle data
       ep->next_pid ^= 1u;
     }else
     {