fix: add note about .combineLatest kicking in only after all 3 observable produce an event change

Kaushik Gopal · Kaushik Gopal · commit d5828836ae4a · 2015-04-22T00:13:36.000-07:00
diff --git a/README.md b/README.md
@@ -78,7 +78,9 @@ Thanks to Dan Lew for giving me this idea in the [fragmented podcast - episode #
 
 `.combineLatest` allows you to monitor the state of multiple observables at once compactly at a single location. The example demonstrated shows how you can use `.combineLatest` to validate a basic form. There are 3 primary inputs for this form to be considered "valid" (an email, a password and a number). The form will turn valid (the text below turns blue :P) once all the inputs are valid. If they are not, an error is shown against the invalid inputs.
 
-We have 3 independent observables that track the text/input changes for each of the form fields (RxAndroid's `WidgetObservable` comes in handy to monitor the text changes). After an event change is noticed from all 3 inputs, the result is "combined" and the form is evaluated for validity.
+We have 3 independent observables that track the text/input changes for each of the form fields (RxAndroid's `WidgetObservable` comes in handy to monitor the text changes). After an event change is noticed from **all** 3 inputs, the result is "combined" and the form is evaluated for validity.
+
+Note that the `Func3` function that checks for validity, kicks in only after ALL 3 inputs have received a text change event.
 
 The value of this technique becomes more apparent when you have more number of input fields in a form. Handling it otherwise with a bunch of booleans makes the code cluttered and kind of difficult to follow. But using `.combineLatest` all that logic is concentrated in a nice compact block of code (I still use booleans but that was to make the example more readable).
 
