diff --git a/ripemd160-compress.c b/ripemd160-compress.c
index dbc01a984b1f98fe1708f22be3ee2e13078abff7..ca815fe4dbce47e2f2c0a0ed1a21926e13289530 100644
--- a/ripemd160-compress.c
+++ b/ripemd160-compress.c
@@ -1,4 +1,7 @@
-/* ripemd160-compress.c  -  RIPE-MD160 (Transform function)
+/* ripemd160-compress.c  -  RIPE-MD160 (Transform function) */
+
+/* nettle, low-level cryptographics library
+ *
  * Copyright (C) 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
  *
  * The nettle library is free software; you can redistribute it and/or modify
diff --git a/ripemd160.c b/ripemd160.c
index 3f490046ca8dd512681a9d8139ecfa3670e122c5..14bc97060ae47e215f2f7888a9b02e728abc683d 100644
--- a/ripemd160.c
+++ b/ripemd160.c
@@ -1,5 +1,9 @@
-/* ripemd160.c  -  RIPE-MD160
+/* ripemd160.c  -  RIPE-MD160 */
+
+/* nettle, low-level cryptographics library
+ *
  * Copyright (C) 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+ * Copyright (C) 2011 Niels Möller
  *
  * The nettle library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by