README.md in letter_avatar-0.1.3 vs README.md in letter_avatar-0.1.4

@@ -51,10 +51,18 @@
   config.cache_base_path = 'public/system/lets' # default is 'public/system'
   config.colors_palette = :iwanthue             # default is :google
 end
 ```
 
+#### Color palette
+
+We have two color palettes implemented: `iwanthue` and `google`.
+
+Each of them have different colors, but the `iwanthue` also differently calculates the color for specyfied username.
+
+The `google` selected will generate the same avatar for both, "Krzysiek" and "ksz2k" usernames given (both of them starts with letter "k"), but `iwanthue` will calculate it's md5 and then selects color, so there's huge chance that these usernames get different colors.
+
 ## Usage
 
 ```ruby
 LetterAvatar.generate 'ksz2k', 200
 => "public/system/letter_avatars/2/K/87_178_230/200.png"
@@ -70,9 +78,11 @@
 
 * and in your view:
 
   ```ruby
   letter_avatar_for('ksz2k', 200)
+# or even
+letter_avatar_tag('ksz2k', 200, class: 'av')
   ```
 
 ### Way to support non [a-z0-9] charsets
 
 ```rb