wordsmithing

Author: ryanflorence

upgrade-guides/v2.0.0.md

@@ -26,7 +26,7 @@ The deprecation warnings should also lead you to the relevant part of this docum
 
 ### Default Hash History
 
-`Router` used to default to creating a hash history, it no longer creates a default, you must provide one.
+`Router` used to default to creating a hash history, it no longer creates a default, you must provide one. This helps keep your app's bundle size down by not including hash history no matter what history you're actually using.
 
 ```js
 // v1.x