diff --git a/include/netutils/md5.h b/include/netutils/md5.h
index d5bd3e3d5..9e138c350 100644
--- a/include/netutils/md5.h
+++ b/include/netutils/md5.h
@@ -10,6 +10,8 @@
  *
  *   This code implements the MD5 message-digest algorithm.
  *   The algorithm is due to Ron Rivest.  This code was
+ *   written by Colin Plumb in 1993, no copyright is claimed.
+ *
  *   This code is in the public domain; do with it what you wish.
  *
  *   Equivalent code is available from RSA Data Security, Inc.