1 files changed, 10 insertions, 0 deletions
diff --git a/mdadm.8 b/mdadm.8
index b618f5a..6160462 100644
--- a/mdadm.8
+++ b/mdadm.8
@@ -1259,6 +1259,16 @@ is being created, then the name
 .B home
 will be used.
 
+A new array will normally get a randomly assigned 128bit UUID which is
+very likely to be unique.  If you have a specific need, you can choose
+a UUID for the array by giving the
+.B --uuid=
+option.  Be warned that creating two arrays with the same UUID is a
+recipe for disaster.  Also, using
+.B --uuid=
+when creating a v0.90 array will silently override any
+.B --homehost=
+setting.
 '''If the
 '''.B --size
 '''option is given, it is not necessary to list any component-devices in this command.