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-rw-r--r--tools/perf/Documentation/perf-intel-pt.txt3
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diff --git a/tools/perf/Documentation/perf-intel-pt.txt b/tools/perf/Documentation/perf-intel-pt.txt
index d22dead7bbe0..4666e4a83615 100644
--- a/tools/perf/Documentation/perf-intel-pt.txt
+++ b/tools/perf/Documentation/perf-intel-pt.txt
@@ -886,6 +886,9 @@ and that the resulting file may be very large. The "d" option may be followed
by flags which affect what debug messages will or will not be logged. Each flag
must be preceded by either '+' or '-'. The flags support by Intel PT are:
-a Suppress logging of perf events
+ +a Log all perf events
+By default, logged perf events are filtered by any specified time ranges, but
+flag +a overrides that.
In addition, the period of the "instructions" event can be specified. e.g.