Add note about Android left button icon constraint (wix#2963)

JuanAlejandro · Apr 4, 2018 · fa0015a · fa0015a
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diff --git a/docs/adding-buttons-to-the-navigator.md b/docs/adding-buttons-to-the-navigator.md
@@ -101,13 +101,16 @@ More information about these glyphs can be found in [Apple's Human Interface Gui
 
 
 ##### Android left button
+
 On Android, four button types are supported by default without the need to provide an icon. You can use them by specifying one of the following ids in your left button definition:
 
 * back
 * cancel
 * accept
 * sideMenu
 
+Except for these 4 cases, the left button **must** have an icon on Android. It can't be a text only button.
+
 #### Custom Navigation Buttons
 
 On iOS, react-native-navigation uses `UIBarButtonItem` to display all items in the navigation bar. Instead of using images or text for normal `UIBarButtonItem`s, you can supply a custom component to be displayed within a custom view of a `UIBarButtonItem`, using the `component` property when specifying a navigation button.