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-rw-r--r--docs/users_guide/eventlog-formats.rst8
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diff --git a/docs/users_guide/eventlog-formats.rst b/docs/users_guide/eventlog-formats.rst
index 6fd7d89b7e..0590fc65db 100644
--- a/docs/users_guide/eventlog-formats.rst
+++ b/docs/users_guide/eventlog-formats.rst
@@ -84,6 +84,14 @@ in length a single sample may need to be split among multiple
``EVENT_HEAP_PROF_SAMPLE`` events. The precise format of the census entries is
determined by the break-down type.
+At the end of the sample period the ``EVENT_HEAP_PROF_SAMPLE_END`` event if
+emitted. This is useful to properly delimit the sampling period and to record
+the total time spent profiling.
+
+
+ * ``EVENT_HEAP_PROF_SAMPLE_END``
+ * ``Word64``: sample number
+
Cost-centre break-down
^^^^^^^^^^^^^^^^^^^^^^