more docs

Author: jdegoes

README.md

@@ -206,7 +206,9 @@ runPar (f <$> Par (Ajax.get "http://foo.com") <*> Par (Ajax.get "http://foo.com"
 
 The `(<|>)` operator of the `Alt` instance of `Par` allows you to race two asynchronous computations, and use whichever value comes back first (or the first error, if both err).
 
-Finally, the `runPar` function allows you to unwrap the `Aff` and return to normal monadic (sequential) composition.
+The `runPar` function allows you to unwrap the `Aff` and return to normal monadic (sequential) composition.
+
+A parallel computation can be canceled if both of its individual components can be canceled.
 
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