--- a/scripts/signal/fftconv.m
+++ b/scripts/signal/fftconv.m
@@ -1,6 +1,24 @@
+# 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 c = fftconv (a, b, N)
 
-# usage:  fftconv (a, b [, N])
+# usage: fftconv (a, b [, N])
 #
 # c = fftconv (a, b) returns the convolution of the vectors a and b,
 # a vector with length equal to length (a) + length (b) - 1.  
@@ -10,11 +28,10 @@
 # The computation uses the FFT by calling fftfilt.  If the optional
 # argument N is specified, an N-point FFT is used.
 
-# Written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Sep 3, 1994
-# Copyright Dept of Statistics and Probability Theory TU Wien
+# Written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Sep 3, 1994.
   
   if (nargin < 2 || nargin > 3)
-    usage (" fftconv (b, x [, N])");
+    usage ("fftconv (b, x [, N])");
   endif
   
   if (is_matrix (a) || is_matrix (b))
@@ -32,7 +49,7 @@
       c = fftfilt (a, b);
     else
       if !(is_scalar (N))
-	error ("fftconv:  N has to be a scalar");
+	error ("fftconv: N has to be a scalar");
       endif
       c = fftfilt (a, b, N);
     endif