README in posix_mq-0.5.1 vs README in posix_mq-0.6.0

@@ -24,9 +24,11 @@
 * Optional timeouts may be applied to send and receive operations.
 
 * Thread-safe blocking operations under Ruby 1.9, releases GVL
   before blocking operations.
 
+* Works under Ruby 1.8, Ruby 1.9 and Rubinius 1.2
+
 * Documented library API
 
 * Includes a generic "posix-mq-rb" command-line tool with manpage.
 
 == Install