README.md in letter_avatar-0.3.0 vs README.md in letter_avatar-0.3.1

@@ -46,13 +46,14 @@
 
 ## Configuration
 
 ```ruby
 LetterAvatar.setup do |config|
-  config.cache_base_path   = 'public/system/lets' # default is 'public/system'
-  config.colors_palette    = :iwanthue            # default is :google
-  config.weight            = 500                  # default is 300
-  config.annotate_position = '-0+10'              # default is -0+5
+  config.fill_color        = 'rgba(255, 255, 255, 1)' # default is 'rgba(255, 255, 255, 0.65)'
+  config.cache_base_path   = 'public/system/lets'     # default is 'public/system'
+  config.colors_palette    = :iwanthue                # default is :google
+  config.weight            = 500                      # default is 300
+  config.annotate_position = '-0+10'                  # default is -0+5
 end
 ```
 
 #### Color palette