Added a note about throttled methods.

Author: p01

src/lib/functionprototype.js

@@ -1,6 +1,11 @@
 /**
  * Throttle the function to run at most every delay ms
  * @argument delay {Number}
+ *
+ * Note: Throttled methods are argument-less because we don't know which set of
+ * arguments ( among the ones passed to all the throttled calls ) to pass to the
+ * method it is eventually called. Instead they should use a state or context
+ * variable of their scope.
  */
 Function.prototype.throttle || (Function.prototype.throttle = function(delay)
 {