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-rw-r--r--erts/doc/src/erlang.xml5
1 files changed, 5 insertions, 0 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index f41ed87048..0e82ceba7d 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -10129,6 +10129,11 @@ timestamp() ->
time stamp flags are remembered, so if two are passed
and the one with highest precedence later is disabled,
the other one becomes active.</p>
+ <p>If a match specification (applicable only for <c>call</c>, <c>send</c>
+ and <c>'receive'</c> tracing) contains a <c>{message}</c> action
+ function with a non-boolean value, that value is added as an extra
+ element to the message tuple either in the last position or before
+ the timestamp (if it is present).</p>
<p>Trace messages:</p>
<marker id="trace_3_trace_messages"></marker>
<taglist>