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diff --git a/PHILOSOPHY b/PHILOSOPHY
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+++ b/PHILOSOPHY
@@ -137,3 +137,8 @@ Unicorn is highly inefficient for Comet/reverse-HTTP/push applications
  where the HTTP connection spends a large amount of time idle.
  Nevertheless, the ease of troubleshooting, debugging, and management of
  Unicorn may still outweigh the drawbacks for these applications.
+
+The {Rainbows!}[http://rainbows.rubyforge.org/] aims to fill the gap for
+odd corner cases where the nginx + Unicorn combination is not enough.
+Keep in mind that Rainbows! is still very new (as of October 2009), far
+more ambitious, and far less tested than Unicorn.