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@@ -137,6 +137,10 @@ If your coverage results seem to be overlooking code that you know has been
executed, try running coverage.py again with the ``--timid`` flag. This uses a
simpler but slower trace method, and might be needed in rare cases.
+Coverage.py sets an environment variable, ``COVERAGE_RUN`` to indicate that
+your code is running under coverage measurement. The value is not relevant,
+and may change in the future.
+
.. _cmd_warnings: