--- a/scripts/linear-algebra/null.m
+++ b/scripts/linear-algebra/null.m
@@ -1,3 +1,21 @@
+# Copyright (C) 1995 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 2, 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, write to the Free
+# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
 function retval = null (A, tol)
 
 # usage: null (A, tol)
@@ -10,8 +28,7 @@
 # max (size (A)) * sigma_max (A) * eps, where sigma_max (A) is the
 # maximal singular value of A. 
 
-# written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Dec 24, 1993
-# copyright Dept of Probability Theory and Statistics TU Wien
+# Written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Dec 24, 1993.
 
   [U, S, V] = svd (A);
 
@@ -22,7 +39,7 @@
   if (nargin == 1)
     tol = max (size (A)) * s (1) * eps;
   else (nargin != 2)
-    usage ("null(A [, tol])"); 
+    usage ("null (A [, tol])"); 
   endif
 
   rank = sum (s > tol);