Say I have a MATLAB object defined in a class file

classdef foo

   properties
      bar
   end

end

And I create a foo object

myfoo = foo();

Now I want to add another field to foo dynamically. What I want is

foo.newfield = 42;

but this will throw an error.

I know there is a way to dynamically add a field/property to a MATLAB object but I can't remember it or find it easily in the help. Anyone know the syntax?