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-rw-r--r--tools/perf/Documentation/itrace.txt3
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diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index c52755481e2f..0916bbfe64cb 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
@@ -62,6 +64,7 @@
debug messages will or will not be logged. Each flag must be preceded
by either '+' or '-'. The flags are:
a all perf events
+ e output only on errors (size configurable - see linkperf:perf-config[1])
o output to stdout
If supported, the 'q' option may be repeated to increase the effect.