Updated Common snapshots and holds (markdown)

Common-snapshots-and-holds.md

@@ -18,3 +18,8 @@ If there is no snapshot in common, the only way to continue is to destroy all th
 
 ## Holds to the rescue
 
+To prevent accidental deletion of the common snapshot zfs-autobackup uses holds.
+
+This can be quite frustrating for new users who try to delete old datasets that still have holds. (`Dataset is busy`) Use `zfs holds ` and `zfs release` to release a snapshot.
+
+If you know what you're doing you can use --no-holds.