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@@ -212,6 +212,11 @@ suffix. Here are some examples of data files that can be combined::
.coverage.20120807T212300
.coverage.last_good_run.ok
+An existing combined data file is ignored and re-written. If you want to use
+**combine** to accumulate results into the .coverage data file over a number of
+runs, use the ``--append`` switch on the **combine** command. This behavior
+was the default before version 4.2.
+
The ``run --parallel-mode`` switch automatically creates separate data files
for each run which can be combined later. The file names include the machine
name, the process id, and a random number::