diff --git a/src/warden-server/doc/warden20to21.patch b/src/warden-server/doc/warden20to21.patch
new file mode 100644
index 0000000000000000000000000000000000000000..ef22e9e5e2bd08c20d4352979cc61e6cfcf84b16
--- /dev/null
+++ b/src/warden-server/doc/warden20to21.patch
@@ -0,0 +1,2 @@
+ALTER TABLE  `clients` CHANGE  `registered`  `registered` TIMESTAMP NOT NULL DEFAULT  '0000-00-00 00:00:00';
+ALTER TABLE  `events` CHANGE  `detected`  `detected` TIMESTAMP NOT NULL DEFAULT  '0000-00-00 00:00:00';