README.md in random-port-0.1.0 vs README.md in random-port-0.2.0

@@ -36,9 +36,17 @@
 pool = RandomPort::Pool.new
 port = pool.acquire
 pool.release(port)
 ```
 
+You can also use a pre-defined `Pool::SINGLETON` singleton:
+
+```ruby
+RandomPort::Pool::SINGLETON.acquire do |port|
+  # Use it here...
+end
+```
+
 The pool is thread-safe.
 
 # License
 
 (The MIT License)