--- a/scripts/signal/sinc.m
+++ b/scripts/signal/sinc.m
@@ -1,13 +1,32 @@
+### Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA
+### 02111-1307, USA.
+
 function result = sinc (x)
 
-# usage: sinc(x)
-#
-#        Returns sin(pi*x)/(pi*x).
+  ## usage: sinc(x)
+  ##
+  ##        Returns sin(pi*x)/(pi*x).
 
-# We either need to set the do_fortran_indexing variable to "true"
-# or use reshape to convert the input matrix to a vector, so that
-# we can use find to determine the elements of x that equal zero.
-# I prefer reshaping.
+  ## We either need to set the do_fortran_indexing variable to "true"
+  ## or use reshape to convert the input matrix to a vector, so that
+  ## we can use find to determine the elements of x that equal zero.
+  ## I prefer reshaping.
 
   [nr, nc] = size(x);
 
@@ -15,10 +34,10 @@
 
   x = reshape(x,nels,1);
 
-# Set result to all ones initially.
+  ## Set result to all ones initially.
   result = ones(nels,1);
 
-# Find non-zero elements in the input matrix.
+  ## Find non-zero elements in the input matrix.
   i = find(x);
 
   if (!isempty(i))