--- a/error.c	Fri Sep 14 22:23:04 2007 +0200
+++ b/error.c	Fri Sep 14 22:26:58 2007 +0200
@@ -1,3 +1,9 @@
+/*
+    stdin mix - a mixer/multiplexer for stdin to processes
+    Copyright (C) 2007  Lluís Batlle i Rossell
+
+    Please find the license in the provided COPYING file.
+*/
 #include <stdio.h>
 #include <stdlib.h>