README in posix_mq-0.2.0 vs README in posix_mq-0.3.0

@@ -9,18 +9,23 @@
 POSIX message queues are not intended to replace userspace,
 network-aware message queue implementations.
 
 == Features
 
-* Supports message notifications via signals.
+* Supports message notifications via signals on all platforms
 
 * Supports portable non-blocking operation.  Under Linux 2.6.6+ and
   FreeBSD 7.2+, POSIX_MQ objects may even be used with event
   notification mechanisms such as IO.select.
 
+* Supports notifications via block execution in a separate thread
+  on platforms that implement SIGEV_THREAD for mq_notify(3),
+  currently only GNU/Linux.
+
 * Optional timeouts may be applied to send and receive operations.
 
-* Thread-safe under Ruby 1.9, releases GVL before blocking operations.
+* Thread-safe blocking operations under Ruby 1.9, releases GVL
+  before blocking operations.
 
 * Documented library API
 
 * Includes a generic "posix-mq.rb" command-line tool with manpage.