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diff --git a/doc/misc/ert.texi b/doc/misc/ert.texi
index a4e2cb506a3..fafdb8c4eb4 100644
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+++ b/doc/misc/ert.texi
@@ -347,6 +347,10 @@ emacs -batch -l ert -l my-tests.el \
-eval '(ert-run-tests-batch-and-exit "to-match")'
@end example
+By default, ERT test failure summaries are quite brief in batch
+mode--only the names of the failed tests are listed. If the
+EMACS_TEST_VERBOSE environment variable is set, the failure summaries
+will also include the data from the failing test.
@node Test Selectors
@section Test Selectors