State Ruby 1.9 requirement

nicksieger · Mar 16, 2012 · 0e11517 · 0e11517
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@@ -13,6 +13,11 @@ allow decomposing the request pipeline into a flat sequence of
 function applications over a request and a response, these kinds of
 cheeky gyrations may be necessary.
 
+## Requirements
+
+Because Rack::Chain relies on fibers for its operation, Ruby 1.9 is
+required.
+
 ## Usage
 
 To use Rack::Chain with existing Rack applications, place the