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diff --git a/doc/cmd.rst b/doc/cmd.rst
index 111d1274..b4bf41ab 100644
--- a/doc/cmd.rst
+++ b/doc/cmd.rst
@@ -594,3 +594,5 @@ a comma-separated list of these options.
The debug output goes to stderr, unless the ``COVERAGE_DEBUG_FILE`` environment
variable names a different file, which will be appended to.
+``COVERAGE_DEBUG_FILE`` accepts the special names ``stdout`` and ``stderr`` to
+write to those destinations.