--- a/scripts/control/bddemo.m
+++ b/scripts/control/bddemo.m
@@ -15,9 +15,13 @@
 # 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. 
+
+## -*- texinfo -*-
+## @deftypefn {Function File } { outputs =} bddemo ( inputs ) 
+##  Octave Controls toolbox demo: Block Diagram Manipulations demo
+## @end deftypefn
  
 function bddemo()
-# Octave Controls toolbox demo: Block Diagram Manipulations demo
 # Written by David Clem August 15, 1994
 # Modified by A S Hodel Summer-Fall 1996