README.md in iso-0.0.2 vs README.md in iso-0.0.3

- old
+ new
@@ -42,8 +42,13 @@
 	  			@name="Portuguese">,
 	 		@region=#<ISO::Region:0x007fe2ba412e28
 				@code="BR",
 				@name="Brazil">>
 				
+You can check if a Tag is valid like so :
+
+  > ISO::Tag.new('pt-BR').valid? => true
+  > ISO::Tag.new('lolcat').valid? => false
+
 ## I18n
 
-Language and region names are internationalized - [contribute to the I18n project directly on Locale](http://www.localeapp.com/projects/1763) for any changes.
\ No newline at end of file
+Language and region names are internationalized - [contribute to the I18n project directly on Locale](http://www.localeapp.com/projects/1763) for any changes.