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diff --git a/Doc/library/doctest.rst b/Doc/library/doctest.rst
index 222c719..200de45 100644
--- a/Doc/library/doctest.rst
+++ b/Doc/library/doctest.rst
@@ -633,6 +633,16 @@ The second group of options controls how test failures are reported:
the output is suppressed.
+.. data:: FAIL_FAST
+
+ When specified, exit after the first failing example and don't attempt to run
+ the remaining examples. Thus, the number of failures reported will be at most
+ 1. This flag may be useful during debugging, since examples after the first
+ failure won't even produce debugging output.
+
+ .. versionadded:: 3.4
+
+
.. data:: REPORTING_FLAGS
A bitmask or'ing together all the reporting flags above.