function Str = describe(Constr, keyword)
%DESCRIBE  Returns constraint description.

%   Authors: P. Gahinet, Bora Eryilmaz
%   Revised:
%   Copyright 1986-2002 The MathWorks, Inc. 
%   $Revision: 1.1.6.3 $ $Date: 2004/12/26 21:51:37 $

Str = xlate('Natural Frequency');

if (nargin == 2) && strcmp(keyword, 'detail')
  str1 = unitconv(Constr.Frequency, 'rad/sec', Constr.FrequencyUnits);
  
  Str = sprintf('%s (%0.3g)', Str, str1);
end