Minor updates to README

Author: auser

Contributing.md

@@ -36,6 +36,8 @@ When the user accessess a Firebase ref, the `Database` instance creates a new in
 const ref = db.ref('/events');
 ```
 
+The `DatabaseRef` class is the wrapper that maps to Firebase database points. For efficiency, the `paths` are stored as an array so we can walk up and down the firebase database using the `parent()` and `child()` methods on a database ref.
+
 Calling `getAt()` on the `ref` (an instance of the `DatabaseRef` class) will make a call to the **native** SDK using a method called `promisify()`
 
 ```javascript

README.md

@@ -483,7 +483,7 @@ firestack.setStorageUrl(`gs://${config.firebase.storageBucket}`)
 .catch(() => console.error('This is weird: something happened...'))
 ```
 
-If the `storageBucket` key is passed as a configuration option, this method is automatically called for us by default.
+If the `storageBucket` key is passed as a configuration option, this method is automatically called by default.
 
 #### uploadFile()