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diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index c2182cbabde3..82ff7dad40c2 100644
--- a/tools/perf/Documentation/itrace.txt
+++ b/tools/perf/Documentation/itrace.txt
@@ -5,6 +5,8 @@
x synthesize transactions events
w synthesize ptwrite events
p synthesize power events
+ o synthesize other events recorded due to the use
+ of aux-output (refer to perf record)
e synthesize error events
d create a debug log
g synthesize a call chain (use with i or x)