Formatting mistake at "What is the arguments object?" page

[floreapaun]

myfunc
  .apply(obj, arguments)
  // concat arguments onto the
  .Array.prototype.concat.apply([1, 2, 3], arguments);

I think this should be written as:

myfunc.apply(obj, arguments);

// concat arguments onto the
Array.prototype.concat.apply([1, 2, 3], arguments);

I don't know what is the meaning of that period on the concat function.