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-rw-r--r--docs/users_guide/runtime_control.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/users_guide/runtime_control.rst b/docs/users_guide/runtime_control.rst
index 6d60eb507e..931710d06f 100644
--- a/docs/users_guide/runtime_control.rst
+++ b/docs/users_guide/runtime_control.rst
@@ -196,11 +196,17 @@ Furthermore GHC lets you specify the way event log data (see :rts-flag:`-l
Hands buffered event log data to your event log writer. Return true on success.
Required for a custom :c:type:`EventLogWriter`.
+ Note that this function may be called by multiple threads
+ simultaneously.
+
.. c:member:: void flushEventLog(void)
Flush buffers (if any) of your custom :c:type:`EventLogWriter`. This can
be ``NULL``.
+ Note that this function may be called by multiple threads
+ simultaneously.
+
.. c:member:: void stopEventLogWriter(void)
Called when event logging is about to stop. This can be ``NULL``.