add comment for udp spec location

diff --git a/opentracker.c b/opentracker.c
index 36fa9897245afeb89567fc9dcad5e46090d541d9..1a056e6656f15df7d1417d76d84e767203ac60ad 100644 (file)
--- a/opentracker.c
+++ b/opentracker.c
@@ -595,6 +595,8 @@ static void handle_timeouted( void ) {
   }
 }
 
+/* UDP implementation according to http://xbtt.sourceforge.net/udp_tracker_protocol.html */
+
 static void handle_udp4( int64 serversocket ) {
   ot_peer     peer;
   ot_torrent *torrent;