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diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
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--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -126,6 +126,21 @@ Default is to monitor all CPUS.
--symbols::
Only consider these symbols.
+-G [type,min,order]::
+--call-graph::
+ Display call chains using type, min percent threshold and order.
+ type can be either:
+ - flat: single column, linear exposure of call chains.
+ - graph: use a graph tree, displaying absolute overhead rates.
+ - fractal: like graph, but displays relative rates. Each branch of
+ the tree is considered as a new profiled object.
+
+ order can be either:
+ - callee: callee based call graph.
+ - caller: inverted caller based call graph.
+
+ Default: fractal,0.5,callee.
+
INTERACTIVE PROMPTING KEYS
--------------------------