diff --git a/docs/ref/databases.txt b/docs/ref/databases.txt
index a4e6724c46..75e2d085e8 100644
--- a/docs/ref/databases.txt
+++ b/docs/ref/databases.txt
@@ -214,7 +214,10 @@ full-text indexing and searching.
 
 Since MySQL 5.5.5, the default storage engine is InnoDB_. This engine is fully
 transactional and supports foreign key references. It's probably the best
-choice at this point.
+choice at this point. However, note that the the InnoDB autoincrement counter
+is lost on a MySQL restart because it does not remember the
+``AUTO_INCREMENT`` value, instead recreating it as "max(id)+1". This may
+result in an inadvertent reuse of :class:`~django.db.models.AutoField` values.
 
 If you upgrade an existing project to MySQL 5.5.5 and subsequently add some
 tables, ensure that your tables are using the same storage engine (i.e. MyISAM