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-rw-r--r--docs/ref/databases.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/ref/databases.txt b/docs/ref/databases.txt
index 9ea0fe72cc..ae47667628 100644
--- a/docs/ref/databases.txt
+++ b/docs/ref/databases.txt
@@ -372,6 +372,9 @@ store a timezone-aware ``time`` or ``datetime`` to a
:class:`~django.db.models.TimeField` or :class:`~django.db.models.DateTimeField`
respectively, a ``ValueError`` is raised rather than truncating data.
+MySQL does not store fractions of seconds. Fractions of seconds are truncated
+to zero when the time is stored.
+
Row locking with ``QuerySet.select_for_update()``
-------------------------------------------------