diff --git a/SysadminTips.page b/SysadminTips.page
index 6d84ebc..7b96778 100644
--- a/SysadminTips.page
+++ b/SysadminTips.page
@@ -1,3 +1,9 @@
+mkfs.ext4 for old systems in rescue mode (Debien Wheezy, …).
+
+~~~
+mkfs.ext4 -O ^64bit,^metadata_csum
+~~~
+
 Send a mail from queue.
 
 ```