README.md in musicbrainz-0.7.4 vs README.md in musicbrainz-0.7.5

@@ -78,24 +78,25 @@
 
 MusicBrainz::ReleaseGroup
 ```ruby
 # Class Methods
 MusicBrainz::ReleaseGroup.find(id)
-MusicBrainz::ReleaseGroup.find_by_artist_and_title(artist_name, title, type: 'Album')
+MusicBrainz::ReleaseGroup.find_by_artist_and_title(artist_name, title, 'Album') # 3rd arg optional
 MusicBrainz::ReleaseGroup.search(artist_name, title)
-MusicBrainz::ReleaseGroup.search(artist_name, title, type: 'Album')
+MusicBrainz::ReleaseGroup.search(artist_name, title, 'Album') # 3rd arg optional
 
 # Instance Methods
 @release_group.releases
 
 # Fields
 {
   :id                 => String,
   :type               => String,
   :title              => String,
   :desc               => String,
-  :first_release_date => Date
+  :first_release_date => Date,
+  :urls               => Hash
 }
 ```
 
 MusicBrainz::Release
 ```ruby
@@ -122,9 +123,10 @@
 
 MusicBrainz::Track
 ```ruby
 # Class Methods
 MusicBrainz::Track.find(id)
+MusicBrainz::ReleaseGroup.search(artist_name, track_name)
 
 # Fields
 {
   :position     => Integer,
   :recording_id => String,