Explain 'top.children' variable.

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/Documentation/perf-config.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index 879f037..c03ee94 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -406,6 +406,13 @@ report.*::
                     0.07%   0.00%  noploop  ld-2.15.so         [.] strcmp
                     0.03%   0.00%  noploop  [kernel.kallsyms]  [k] 
timerqueue_del
 
+top.*::
+       top.children::
+               This option means same as report.children. So if it is true,
+               the output of 'top' command will have 'Children' overhead column
+               as well as 'Self' overhead column by default.
+               The default is true.
+
 SEE ALSO
 --------
 linkperf:perf[1]
-- 
1.9.1

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