--- a/scripts/image/autumn.m
+++ b/scripts/image/autumn.m
@@ -17,33 +17,35 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn {Function File} {} autumn (@var{n})
-## Create color colormap.  This colormap is red through orange to yellow.
-## The argument @var{n} should be a scalar.  If it
-## is omitted, the length of the current colormap or 64 is assumed.
+## @deftypefn  {Function File} {@var{map} =} autumn ()
+## @deftypefnx {Function File} {@var{map} =} autumn (@var{n})
+## Create color colormap.  This colormap ranges from red through orange
+## to yellow.
+## The argument @var{n} must be a scalar.  
+## If unspecified, the length of the current colormap, or 64, is used.
 ## @seealso{colormap}
 ## @end deftypefn
 
 ## Author:  Kai Habel <kai.habel@gmx.de>
 
-function map = autumn (number)
+function map = autumn (n)
 
   if (nargin == 0)
-    number = rows (colormap);
+    n = rows (colormap);
   elseif (nargin == 1)
-    if (! isscalar (number))
+    if (! isscalar (n))
       error ("autumn: argument must be a scalar");
     endif
   else
     print_usage ();
   endif
 
-  if (number == 1)
+  if (n == 1)
     map = [1, 0, 0];  
-  elseif (number > 1)
-    r = ones (number, 1);
-    g = (0:number - 1)' ./ (number - 1);
-    b = zeros (number, 1);
+  elseif (n > 1)
+    r = ones (n, 1);
+    g = (0:n - 1)' ./ (n - 1);
+    b = zeros (n, 1);
     map = [r, g, b];
   else
     map = [];
@@ -55,5 +57,5 @@
 %! ## Show the 'autumn' colormap as an image
 %! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
 %! axis ([1, 64, 0, 1], "ticy", "xy")
-%! colormap autumn
+%! colormap (autumn (64))