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diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index c52755481e2f..6b189669c450 100644
--- a/tools/perf/Documentation/itrace.txt
+++ b/tools/perf/Documentation/itrace.txt
@@ -7,6 +7,8 @@
p synthesize power events (incl. PSB events for Intel PT)
o synthesize other events recorded due to the use
of aux-output (refer to perf record)
+ I synthesize interrupt or similar (asynchronous) events
+ (e.g. Intel PT Event Trace)
e synthesize error events
d create a debug log
f synthesize first level cache events