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@@ -1,4 +1,14 @@
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 #!/usr/bin/env ruby
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+# We've tried to implement the usage of persistent pipes in Passenger,
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+# but we found out that it made Apache slower than when we use socket
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+# connections. That is in contrast to the results of this benchmark.
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+#
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+# We couldn't have used persistent pipes (for multiple sessions) in
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+# Passenger anyway, because it's too fragile. If something goes wrong
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+# in one session, then the entire pipe becomes unusable for subsequent
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+# sessions because the protocol will be in an undefined state. Sockets
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+# don't have this problem because if an error occurs because each socket
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+# connection belongs to exactly one session.
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 require 'benchmark'
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 ITERATIONS = 100000
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@@ -86,4 +96,4 @@ def benchmark_persistent_pipes
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   printf "%.2f messages per second\n", ITERATIONS / result.real
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 end
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-start
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\ No newline at end of file
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+start