From 155a1c62bd722e11c5f6bc056306d01328f8125f Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Tue, 31 Dec 2019 21:59:34 -0700
Subject: [PATCH] Add documentation

---
 src/board/arduino/mega2560/parallel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/board/arduino/mega2560/parallel.c b/src/board/arduino/mega2560/parallel.c
index dfae4ae..e751a6b 100644
--- a/src/board/arduino/mega2560/parallel.c
+++ b/src/board/arduino/mega2560/parallel.c
@@ -22,6 +22,7 @@ static struct Gpio gpios[24] = {
     GPIO(C, 7), GPIO(C, 6)
 };
 
+// See http://efplus.com/techref/io/parallel/1284/eppmode.htm
 struct ParallelPins {
     // Data (KSO0 - KSO7) - bi-directional
     uint8_t d0;