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-rw-r--r--docs/devel/tracing.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/devel/tracing.rst b/docs/devel/tracing.rst
index 4ebf8e38ea..af395e957d 100644
--- a/docs/devel/tracing.rst
+++ b/docs/devel/tracing.rst
@@ -224,6 +224,9 @@ effectively turns trace events into debug printfs.
 This is the simplest backend and can be used together with existing code that
 uses DPRINTF().
 
+The -msg timestamp=on|off command-line option controls whether or not to print
+the tid/timestamp prefix for each trace event.
+
 Simpletrace
 -----------