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diff --git a/README b/README
index 170e01f..863d89a 100644
--- a/README
+++ b/README
@@ -26,6 +26,8 @@ network-aware message queue implementations.
  * 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.