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-rw-r--r--lib/stdlib/doc/src/calendar.xml6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/stdlib/doc/src/calendar.xml b/lib/stdlib/doc/src/calendar.xml
index 6b4fa7f98a..5aee635c38 100644
--- a/lib/stdlib/doc/src/calendar.xml
+++ b/lib/stdlib/doc/src/calendar.xml
@@ -403,7 +403,11 @@
default is <c>second</c>. If some other unit is given
(<c>millisecond</c>, <c>microsecond</c>, or
<c>nanosecond</c>), the formatted string includes a
- fraction of a second.</p>
+ fraction of a second. The number of fractional second
+ digits is three, six, or nine depending on what time unit
+ is chosen. Notice that trailing zeros are not removed from
+ the fraction.
+ </p>
</item>
</taglist>
<pre>