From 2626c31d3dad8c3dac0a9344d75c9029eb9e0abd Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Wed, 18 Sep 2019 19:43:55 +0200
Subject: [PATCH] links

---
 client/cmdlfhid.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/client/cmdlfhid.c b/client/cmdlfhid.c
index d4d52fa9f..2059066dc 100644
--- a/client/cmdlfhid.c
+++ b/client/cmdlfhid.c
@@ -5,7 +5,17 @@
 // at your option, any later version. See the LICENSE.txt file for the text of
 // the license.
 //-----------------------------------------------------------------------------
-// Low frequency HID commands
+// Low frequency HID commands (known)
+//
+// Useful resources:
+// RF interface, programming a T55x7 clone, 26-bit HID H10301 encoding:
+// http://www.proxmark.org/files/Documents/125%20kHz%20-%20HID/HID_format_example.pdf
+//
+// "Understanding Card Data Formats"
+// https://www.hidglobal.com/sites/default/files/hid-understanding_card_data_formats-wp-en.pdf
+//
+// "What Format Do You Need?"
+// https://www.hidglobal.com/sites/default/files/resource_files/hid-prox-br-en.pdf
 //-----------------------------------------------------------------------------
 
 #include "cmdlfhid.h"