Fix forgotten license comments

diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index 1a6f7e6..e2c8e6e 100644
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -1,4 +1,10 @@
 /* vi: set sw=4 ts=4: */
+/*
+ * packet.c -- packet ops
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
 
 #include <netinet/in.h>
 #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION