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-rw-r--r--docs/users_guide/using-optimisation.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst
index 88356dfb85..185e590534 100644
--- a/docs/users_guide/using-optimisation.rst
+++ b/docs/users_guide/using-optimisation.rst
@@ -230,7 +230,7 @@ by saying ``-fno-wombat``.
Usually GHC black-holes a thunk only when it switches threads. This
flag makes it do so as soon as the thunk is entered. See `Haskell on
a shared-memory
- multiprocessor <http://research.microsoft.com/en-us/um/people/simonpj/papers/parallel/>`__.
+ multiprocessor <http://community.haskell.org/~simonmar/papers/multiproc.pdf>`__.
.. ghc-flag:: -fexcess-precision