diff --git a/sql/mysql/upgrade/3.5.0/document_checkout.sql b/sql/mysql/upgrade/3.5.0/document_checkout.sql
new file mode 100644
index 0000000..ace6cd7
--- /dev/null
+++ b/sql/mysql/upgrade/3.5.0/document_checkout.sql
@@ -0,0 +1 @@
+ALTER TABLE documents ADD checkedout datetime;
\ No newline at end of file