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-rw-r--r--tools/perf/Documentation/itrace.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index 114d0544d7c7..9c0e8586ed47 100644
--- a/tools/perf/Documentation/itrace.txt
+++ b/tools/perf/Documentation/itrace.txt
@@ -53,3 +53,8 @@
The flags are:
o overflow
l trace data lost
+
+ If supported, 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 are:
+ a all perf events