README.md in glob-0.2.2 vs README.md in glob-0.3.0

@@ -26,9 +26,12 @@
 
 - The `include` path adds that node to the new hash.
 - The `exclude` path is the one started by `!`, and will prevent that path from
   being added.
 
+Rules may also have groups. Let's say you want to target `en.*` and `pt.*`; you
+case set `{en,pt}.*` rather than having two separate rules.
+
 The latest rules have more precedence; that means that if you have the rule
 `*.messages.*`, then add a following rule as `!*.messages.bye`, all
 `*.messages.*` but `*.messages.bye` will be included.
 
 ```ruby