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McLachlan
-Named in honour of Sarah McLachlan, the Canadian singer.
+A suite of spacetime codes. The name "McLachlan" is in honour of
+Sarah McLachlan, the Canadian singer.
+
+The code requires Cactus <http://www.cactuscode.org/>. The code is
+generated with Kranc <http://numrel.aei.mpg.de/Research/Kranc/>, which
+requires Mathematica to run.