--- a/liboctave/randpoisson.c
+++ b/liboctave/randpoisson.c
@@ -1,4 +1,27 @@
-/* This code is in the public domain */
+/*
+
+Copyright (C) 2006, 2007 John W. Eaton
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+Octave 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 General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+/* Original version written by Paul Kienzle distributed as free
+   software in the in the public domain.  */
 
 /* Needs the following defines: 
  * NAN: value to return for Not-A-Number