--- a/scripts/control/parallel.m
+++ b/scripts/control/parallel.m
@@ -1,38 +1,39 @@
-# Copyright (C) 1996 Auburn University.  All Rights Reserved.
-#
-# 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 USA. 
+## Copyright (C) 1996 Auburn University.  All Rights Reserved.
+##
+## 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 USA. 
  
+## function sysp = parallel(Asys,Bsys)
+## Forms the parallel connection of two systems.
+##
+##              ____________________
+##              |      ________    |
+##     u  ----->|----> | Asys |--->|----> y1
+##         |    |      --------    |
+##         |    |      ________    |
+##         |--->|----> | Bsys |--->|----> y2
+##              |      --------    |
+##              --------------------
+##                   Ksys
+
 function sysp = parallel(Asys,Bsys)
-# function sysp = parallel(Asys,Bsys)
-# Forms the parallel connection of two systems.
-#
-#              ____________________
-#              |      ________    |
-#     u  ----->|----> | Asys |--->|----> y1
-#         |    |      --------    |
-#         |    |      ________    |
-#         |--->|----> | Bsys |--->|----> y2
-#              |      --------    |
-#              --------------------
-#                   Ksys
 
-# Written by David Clem August 15, 1994
-# completely rewritten Oct 1996 a s hodel
-# SYS_INTERNAL accesses members of system structure
+  ## Written by David Clem August 15, 1994
+  ## completely rewritten Oct 1996 a s hodel
+  ## SYS_INTERNAL accesses members of system structure
 
   if(nargin != 2)
     usage("sysp = parallel(Asys,Bsys)");
@@ -48,10 +49,10 @@
     error(["Asys has ",num2str(mA)," inputs, Bsys has ",num2str(mB)," inputs"]);
   endif
 
-  # save signal names
+  ## save signal names
   Ain = sysgetsignals(Asys,"in");
 
-  # change signal names to avoid warning messages from sysgroup
+  ## change signal names to avoid warning messages from sysgroup
   Asys = syssetsignals(Asys,"in",sysdefioname(length(Ain),"Ain_u"));
   Bsys = syssetsignals(Bsys,"in",sysdefioname(length(Ain),"Bin_u"));