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-rw-r--r--includes/database/database.inc5
1 files changed, 3 insertions, 2 deletions
diff --git a/includes/database/database.inc b/includes/database/database.inc
index dda27d7ba..843117f69 100644
--- a/includes/database/database.inc
+++ b/includes/database/database.inc
@@ -2500,8 +2500,9 @@ function db_close(array $options = array()) {
/**
* Retrieves a unique id.
*
- * Use this function if for some reason you can't use a serial field, normally a
- * serial field with db_last_insert_id is preferred.
+ * Use this function if for some reason you can't use a serial field. Using a
+ * serial field is preferred, and InsertQuery::execute() returns the value of
+ * the last ID inserted.
*
* @param $existing_id
* After a database import, it might be that the sequences table is behind, so