Document initialTabIndex

docs/top-level-api.md

@@ -52,7 +52,8 @@ Navigation.startTabBasedApp({
   tabsStyle: { // optional, add this if you want to style the tab bar beyond the defaults
     tabBarButtonColor: '#ffff00', // optional, change the color of the tab icons and text (also unselected)
     tabBarSelectedButtonColor: '#ff9900', // optional, change the color of the selected tab icon and text (only selected)
-    tabBarBackgroundColor: '#551A8B' // optional, change the background color of the tab bar
+    tabBarBackgroundColor: '#551A8B', // optional, change the background color of the tab bar
+    initialTabIndex: 1, // optional, the default selected bottom tab. Default: 0
   },
   appStyle: {
     orientation: 'portrait' // Sets a specific orientation to the entire app. Default: 'auto'. Supported values: 'auto', 'landscape', 'portrait'