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-rw-r--r--docs/users_guide/eventlog-formats.rst7
1 files changed, 4 insertions, 3 deletions
diff --git a/docs/users_guide/eventlog-formats.rst b/docs/users_guide/eventlog-formats.rst
index dae6de4a84..4d28e1737b 100644
--- a/docs/users_guide/eventlog-formats.rst
+++ b/docs/users_guide/eventlog-formats.rst
@@ -553,11 +553,12 @@ Tracing events
:tag: 18
:length: fixed
- :field Word32: size
+ :field Word32: block size
:field Word64: end time in nanoseconds
- :field Word16: capability number
+ :field Word16: capability number, invalid if ``0xffff``.
- TODO
+ Marks a chunk of events. The events that fit in the next ``block size``
+ bytes all belong to the block marker capability.
.. event-type:: USER_MSG