Document that make -j doesn't need a number

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@@ -166,7 +166,9 @@ Once ``configure`` is done, you can then compile CPython with:
 This will build CPython with only warnings and errors being printed to
 stderr and utilize up to 2 CPU cores. If you are using a multi-core machine
 with more than 2 cores (or a single-core machine), you can adjust the number
-passed into the ``-j`` flag to match the number of cores you have.
+passed into the ``-j`` flag to match the number of cores you have (or if your
+version of Make supports it, you can leave the number off and Make will use
+as many cores as your machine has).
 
 At the end of the build you should see a success message, possibly followed
 by a list of extension modules that haven't been built because their