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-rw-r--r--tools/perf/Documentation/perf-diff.txt2
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diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index 8fff0618c597..cff3d9b6e4a3 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -79,6 +79,8 @@ OPTIONS
-c::
--compute::
Differential computation selection - delta,ratio (default is delta).
+ If '+' is specified as a first character, the output is sorted based
+ on the computation results.
See COMPARISON METHODS section for more info.
COMPARISON METHODS