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diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
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@@ -94,6 +94,13 @@ an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must ha
94corresponding events, i.e., they always refer to events defined earlier on the command 94corresponding events, i.e., they always refer to events defined earlier on the command
95line. 95line.
96 96
97-o file::
98-output file::
99Print the output into the designated file.
100
101--append::
102Append to the output file designated with the -o option. Ignored if -o is not specified.
103
97EXAMPLES 104EXAMPLES
98-------- 105--------
99 106