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-rw-r--r--erts/doc/src/erlang.xml4
1 files changed, 4 insertions, 0 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index e4f245975b..e69f223897 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -2863,6 +2863,10 @@ os_prompt% </pre>
<p>It can only be used to check the local time of day if
the time-zone info of the underlying operating system is
properly configured.</p>
+ <p>If you do not need the return value to be unique and
+ monotonically increasing, use
+ <seealso marker="kernel:os#timestamp/0">os:timestamp/0</seealso>
+ instead to avoid some overhead.</p>
</desc>
</func>
<func>