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-rw-r--r--tools/perf/Documentation/perf-report.txt5
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diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index bd0a029d4c08..e56e3f1344a7 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -377,6 +377,11 @@ OPTIONS
Show event group information together. It forces group output also
if there are no groups defined in data file.
+--group-sort-idx::
+ Sort the output by the event at the index n in group. If n is invalid,
+ sort by the first event. It can support multiple groups with different
+ amount of events. WARNING: This should be used on grouped events.
+
--demangle::
Demangle symbol names to human readable form. It's enabled by default,
disable with --no-demangle.