diff --git a/tools/sexp-conv.c b/tools/sexp-conv.c
index 0cb0269c8cb610d7262f65352ccea50c57a9bf79..cba23e9d2ae2c560cf43aaa6f5b0f5a675c78ce4 100644
--- a/tools/sexp-conv.c
+++ b/tools/sexp-conv.c
@@ -3,6 +3,26 @@
  * Conversion tool for handling the different flavours of sexp
  * syntax. */
 
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2002 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
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
 #if HAVE_CONFIG_H
 # include "config.h"
 #endif